I also noted the zero distance of the load. The KPS formula combines these variables in a direct, easy to calculate way. Simply put, the .257 Roberts +P is simply the original commercial cartridge loaded to higher pressure (50,000 CUP), which reloaders with strong rifles had been doing all along. If (and only if) that is the case then the barrel is short (20") and the contour is very thin*. ), 200 yard KPS = 17.7 (Energy = 1371 ft. (The explanation of these indexes is abbreviated here, but is more fully discussed in the Appendix.). Thus, the 100 yard KPS of this load is: This is merely an example, as KPS can be calculated for any range. Loads with 95 and 90 grain bullets have EKRs of 205 and 175 yards, respectively. lbs. My hope is one of these will be the .257 Roberts. lbs., MPBR = 265 yards (Zero at 225 yards). However, the .243 Winchester cannot match the .257 Roberts as a big game cartridge, although the .243 is arguably a more efficient heavy varmint round. Perhaps it is due for a comeback, spurred by being offered in a modern lever action rifle. If you searching to evaluate 257 Roberts Remington Ammo And 260 Rifle Ammo For Sale price. Those who reflect on the decline of the .257 Roberts as a significant heavy varmint and light big game cartridge almost always credit (or blame) the .243 Winchester. (The .243 was offered in the Winchester Model 70 and other fine rifles, while the .244 was offered in the clunky Remington Model 722.) If you walked into your favorite local gun shop or hunting supply store and did not find 257 Roberts ammo on the shelf, I would not be shocked either. Assuming a field ready weight (rifle, scope, sling and cartridge load) of 8.5 pounds, the recoil of the Long Ranger rifle would fall between 9.0 and 10.0 ft. To my knowledge, the only currently available .257 Roberts production rifle is the Kimber 84M Hunter bolt gun. Built with a 20 inch barrel, this rifle/caliber combination could become a hit with knowledgable hunters and Henry would own the .257 Roberts rifle market. Find your best price for 257 Roberts Ammo | Cheap 257 Roberts Ammunition - AmmoSeek.com Search Engine 2020 (SD is the ratio of a bullet's weight in pounds to the square of its diameter in inches.). The Hornady H.I.T.S. Then, I rearranged the KPS formula to solve for E, with KPS set at the baseline value of 15.0 and (SD x A) = .0112 for the 100 grain .243 bullet. My purpose here is to propose (or plead for) a resurrection of the .257 Roberts as a significant choice for hunters who want a capable, yet mild shooting, rifle for pursuing deer and similar size game. I rest my case that the .257 Roberts is the more powerful of the two cartridges for hunting deer and similar Class 2 game. .257 Load #1: Nosler Custom, 115 gr. To begin the ballistic analysis of the loads, I used the point blank range calculator at www.shooterscalcualtor.com to calculate a +/- 3 inch maximum point blank range (MPBR) for the load. load detailed above is a very strong one. SST bullet, BC .390, MV 2845 f.p.s. lbs. This load produces 1232 ft. lbs. It was created by necking down the 7×57 Mauser case to the 257 bullet size. (I adjusted this to a more normal 22 inch barrel length for a .243 hunting rifle. The result means that the KPS of the load in question will be equal to 15.0 at the range where the energy of the bullet falls to 1339 ft. lbs. Ruger 77 257 Roberts Rifle And Ruger American Rifle 17 YOU ARE IN THE RIGHT PLACE TO GET CHEAP PRICES PRODUCTS HERE. Nosler Partition bullet, BC .391, MV 2700 f.p.s. ), 200 yard KPS = 19.4 (Energy = 1483 ft. However, the comparison is not quite that simple. classification system uses an online calculator to produce a numerical HITS score for rifle cartridge loads. The .257 was designed to run in a bolt gun, and any receiver that was designed for the 7x57mm Mauser will handle the .257 Roberts perfectly. ), 100 yard KPS = 22.0 (Energy = 1631 ft. in.) If nothing else, it would have saved a lot of later confusion. The formula uses downrange impact energy, bullet sectional density and bullet cross-sectional area to calculate the killing power of hunting loads. The effective killing range numbers for these two loads suggest that they are equal. Discussing this issue in detail is outside the scope of this article. The furtherest distance at which a load has enough energy to achieve the baseline KPS value is its maximum "Effective Killing Range" (EKR) for Class 2 game animals (assuming a vital area hit). I did some estimates of recoil with the heavy hunting loads I have featured. The 257 Roberts — Go for a Nostalgic Hunt. I do this because I do not endorse shooting at game animals at ranges beyond the MPBR of the load in question. Remington went on to offer this chambering in the Model 722 bolt action and the Model 760 pump action. It will be put back in service this deer hunting season. The .243 cartridge/load, being faster, must be better, right? If you searching to check on 257 Roberts Rifle Ammo For Sale And 270 Winchester Ammo Australia price. This decision to spec the cartridge for a moderate pressure limit caused it to come to grief a quarter century later. Ruger has also chambered the 257 Roberts in its Model 77 bolt gun, though most other makers have now dropped it from their lineups. Close up of Pronghorn Antelope on VZ 24 Mauser floorplate. The ballistic performance based off four grain types for velocity are … Fortunately, there is a reasonably straightforward way to do this. of energy at 100 yards. ), 265 yard KPS = 15.9 (Energy = 1235 ft. For sale 1982 Remington 700 Classic 257 Roberts. Bullet velocity is not neglected, because velocity is the most important factor in calculating kinetic energy. In a short action, it has the potential for a suitable youth rifle but without care towards optimizing hand loads, can lack the power with many 117 to 120 grain loads to be of any great advantage over the more common .243. Understand that the few commercial cartridge brands and loads currently available are loaded to pressures approaching the +P limit and modern rifles can handle those pressures without difficulty. My example is a Federal Premium .243 Winchester load with a 100 grain soft point spitzer bullet. I do use the +P WW brass. The .243 Win. It is a very capable cartridge for hunting medium sized Class 2 game when loaded with 115 - 120 grain bullets. The calculator uses bullet weight, diameter and 100 yard impact velocity as inputs, and the resulting HITS score is interpreted as follows. How about 17 Hmr Savage Model 93r17 Rifles Reviews And 257 Roberts Rifle Reviews You can order 17 Hmr Savage Model 93r17 Rifles Reviews And 257 Roberts Rifle Re MPBR and zero distances are rounded to the nearest five yards. MV (24 inch barrel). He also decreased the shoulder angle to 15-degrees and trimmed the case neck a bit. However, it was not until I was introduced to the .257 Weatherby that my idea of what a quarter bore should be about. Whenever any of these variables change, the KPS number changes proportionally. I have Game Master 760's in .300 Savage and .257 Roberts. guarantee I put a full-size 2.5-10X 50 mm Zeiss Victory HT with 30 mm tube on the rifle. (20 inch bbl. All of the .257 Roberts loads listed above blow this .243 load away. However, for milder cartridges, such as the .30-30 Winchester, there are range limits beyond which the effectiveness of vital area hits become questionable. Specifically, I hope that Henry Repeating Arms Co. (www.henryusa.com) will chamber their new Long Ranger lever action rifle in .257 Roberts. lbs., depending on the load in question. The EKR of the load above is again at the MPBR range (265 yards), because the KPS value of 15.9 at 265 yards is greater than the baseline KPS of 15. Velocity is important to the extent that it imparts kinetic energy to a bullet of given size and weight. Talk to an expert. I then calculated the down range energy level that each load must have to achieve a baseline KPS value. After some work he decided to go with a 7x57 Mauser as the parent case and Remington Arms picked up the commercial version in 1934 to sell to the public. Gear Review: NcStar / Vism Universal Rear sight tool, GLOCK Spills Details on the New Gen5 Pistols, Watch: DIY Guided Knife Sharpener (With Plans), 5 Photos of Firing Pin Repair on a Colt Single Action Clone, Watch: Making the Mark II Ammo Can Rocket Stove, Second Amendment Foundation: No Open Carry at Political Rallies, Please, Southeast Texas Preppers: Get Your Storm Preps Ready, Advice to New Women Shooters, From Women Shooters, Watch: Putting an Antique Grindstone Back to Work, Watch: Mad Genius Breaks Car; Rides Out on Bike Made From Its Parts, Kimber Goes High Tech with Hunting Pistol. For instance, between 100 and 175 yards, the energy of the 150 grain .30-30 bullet decreases by 27.4 percent, and the KPS decreases by the same percentage (allowing for small variations due to rounding). Though in some circles the 257 Roberts may be considered an obsolete cartridge overshadowed by several other cartridges, several times over past decades the Roberts has experienced a resurgence of interest. It has an even more nostalgic Redfield scope mounted on it. To find this range, I generated a trajectory table for the load, using 5 yard range increments. Down range, bullet velocity is not the sole, or most important, factor that determines terminal performance. That said, I will simply refer to the cartridge and rifles chambered for it as ".257 Roberts" hereafter. ), .243 Win: Federal 100 gr. The .257 Roberts, also known as .257 Bob, is a medium-powered .25 caliber cartridge.It has been described as the best compromise between the low recoil and flat trajectory of smaller calibers such as the .22 and 6mm, and the strong energy but not the strong recoil of larger popular hunting calibers, such as the 7mm family and the popular .30-06. It is clear that the .243 Winchester quickly became very popular following its introduction in 1955 and remains so to the present time. ), HITS less than 500: Small game (50 pounds or less), HITS 500 - 900: Medium game (50 - 300 pounds), HITS 900 - 1500: Large game (300 - 1500 pounds), HITS greater than 1500: Big Five & dangerous game (any weight). The point is that KPS and Effective Killing Range can be very useful tools for shooters who want to evaluate the killing performance of different cartridges and loads. ), 200 yard KPS = 18.4 (Energy = 1360 ft. (Not quite the same range, but very flat shooting.) ), SD .226, A = .0745 sq. In each data set, the first line lists information about the load. lbs. The .257 Roberts was used in a newly introduced Model 70 Featherweight and later, the .25/06 Remington got the nod more often than not. Detachable, steel sling swivel studs and a contoured, effective recoil pad are standard equipment. Load #3 features a 120 grain bullet, the heaviest hunting bullet loaded in the Roberts. (Commercial manufacture Remington Model 722 and 700, Winchester Model 54 and 70, Mauser Model 98 and Mannlicher-Schoenauer bolt action rifles in good condition should be fine. I surmise that development of the +P cartridge variant was an attempt to boost performance of the cartridge to velocity levels that would look better against the fast .243s. Therefore, my main task here is to sell the proposition that the .257 Roberts is a better Class 2 game cartridge than the .243 Winchester. Fellow SIG Fans: Has the P320 Drop Test Scandal Soured You On SIG? I call this the "baseline" KPS value for deer cartridges and loads. This was 1346 ft. lbs. load, detailed above, is 694. Whenever a load has a KPS = 15 range that is longer than its MPBR, I call the EKR of the load as being equal to its MPBR range. .257 Load #3: Federal Vital-Shok, 120 gr. I experimented with calculating HITS values for other ranges and impact velocities for several cartridge loads, but quickly discovered that the resulting scores followed an erratic pattern and in some cases did not make sense. Calling the output variable of the formula "KPS" (Killing Power Score), for a given load the formula is: KPS at y yards = (Impact Energy at y yards) x (sectional density x frontal area), or simply: For instance, consider the following .30-30 Winchester factory load: Hornady 150 gr. Unless you want one for nostalgia, I would go to something else. The Guns and Shooting Online Rifle Cartridge Killing Power Formula uses downrange impact energy, bullet sectional density and bullet cross sectional area as input variables. .257 Load #2: Hornady Superformance, 117 gr. From the trajectory table, I recorded muzzle energy and energy at 100 yards and other relevant distances. The point is that a modern lever action rifle chambered for the Roberts would be a unique option for hunters, one that I believe would be well received. I show data workups for three .257 Roberts factory hunting loads below. Wrong! If you searching to test 22 Marlin Rifle Magazines And 257 Roberts Rifle Manufacturers price. This translates to an effective killing range of 175 to 180 yards. Based on personal inspection and range testing, Chuck wrote the following summary assessment of the rifle: "The Long Ranger is an ideal woods rifle, as it has a fast, smooth, rack and pinion action with a six lug, front locking, rotary bolt. I love the .300 savage for brush country and the .257 rivals my .20-06 in the open. The .257 Roberts was the premier combination varmint/deer cartridge until the .243 Winchester and .244 Remington were introduced in 1955. Once again, here is the strongest .257 Roberts factory load, as detailed above. The .257 Roberts is a low recoiling, mild powered cartridge. I chose 20 inches, because the Henry Long Ranger rifle has a 20 inch barrel. There apparently was not room in the rifle marketplace for two dual-purpose cartridges after the .243 Winchester was introduced and it bested the .244/6mm Remington, .250 Savage and .257 Roberts in the popularity contest, for whatever reasons. Pre 64 Model 70 Winchester Rifles For Sale And Remington Model lbs. This is a standard 100 grain .243 Winchester factory load at a MV of 2960 f.p.s. The 257 Roberts cartridge has a very interesting and curious history. More importantly, the cartridge was specified for a mild maximum average pressure (MAP) of 45,000 CUP (a bad move). It is a shame that Remington did not specify the .257 Roberts for a MAP of 50,000 CUP in the first place. A Glock in the Pocket, Worth Two in the Safe. Factory ammo can still be found, especially if you shop fully-stocked gun stores or gun shows. The .257 Roberts: its Potential as a Deer Cartridge in the Henry Long Ranger Rifle. Remington was the first to commercialize the 257 Roberts in 1934 by chambering their Model 30 bolt action rifle for it. (All three of the .257 Roberts loads have KPS = 15 ranges that are longer than their MPBR distances.). load falls 25 yards short of its MPBR. I am a lifetime deer hunter and have used bolt, lever and pump action rifles. (Hornady HITS is explained in the Appendix.). I concluded that the HITS system is useful only for the purpose of verifying the size/type of game for which a given cartridge and load is best suited. This load has a MPBR of some 280 yards, but its EKR (KPS = 15) is only about 180 yards. The 257 is of course the .25 caliber, using bullets weighing from 60 grains on the light side to 117 or 120 grains for deer hunting. Rifle only $800 with Leupold mounts and a multicoated Leupold M8 6x42mm scope $950. (Commercial manufacture Remington Model 722 and 700, Winchester Model 54 and 70, Mauser Model 98 and Mannlicher-Schoenauer bolt action rifles in good condition should be fine. To summarize, the .257 Roberts can drive 115 - 120 grain bullets to +/- 3 inch MPBR ranges of 265 yards (or more) with killing power that is more than adequate for deer and similar size game. I don't think the .257 will ever make a strong re birth. The 100 yard HITS score for the strongest .243 Win. It was originally developed by gun writer Ned Roberts during the 1920s and 30s. I noted the Effective Killing Range of the load. The remaining (bullet pointed) lines summarize the results. Note that the EKR of the .243 Win. ), 275 yard KPS = 16.9 (Energy = 1292 ft. (22 inch barrel), ME 2162 ft. The next load is the hottest Roberts factory load of which I am aware, driving a 117 grain bullet at an estimated 2845 f.p.s. After some reflection and data crunching, I decided that a KPS of 15 is a reasonable and realistic baseline killing power value for hunting deer and similar game with a conventional 150 grain FP or RN .30-30 load. lbs. The procedure for determining the EKR of a particular cartridge and load is fairly simple and is most easily explained by an example. 257 Roberts could do very well with a 24" barrel for a lot of reasons. .243 Win. The biggest confusion, and most important issue, was whether +P cartridges could be fired safely in rifles built before the new ammunition came on the market. lbs. Next, I developed a trajectory table for the load using the ShootersCalculator trajectory calculator. lbs. Compare prices for Ruger 22 Long Rifle Automatic Pistol Serial Numbers And Ruger 257 Roberts Rifle For Sale You can order Ruger 22 Long Rifle Automatic Pistol S What if .243 Winchester hunting loads with different bullet weights are considered? Winchester - Model 70, .257 Roberts, 24” barrel, claw extractor bolt action rifle, 1949 manufacture date, metal is in 99% condition, perfect bore showing very little if any, use, w... (read more) Gun #: 978363034 I feel this even more strongly after making a detailed examination of the performance and capabilities of the cartridge. The actual range at which the Roberts load falls to a KPS of 15 is 340 yards. In the 1980s more power was loaded in this cartridge, when ammo makers brought out +P loadings. The downrange data are needed to do hunting capability index calculations. Using deer and similar size game as an example, some popular cartridges, such as the .270 Winchester and .308 Winchester, are so powerful that there is no question that they will dependably fell Class 2 game out to their MPBR range or beyond. The .257 was very popular in the '50's and in Inlet, N.Y. a guy killed a 400+ bear just outside of town with one shot from a .257. Therefore, KPS numbers generated from different data inputs (E, SD, or A) are directly comparable. (Assuming a +1.5 inch line of sight.) Despite using lighter bullets in factory loads, the 257 Roberts has been called an ideal cartridge for deer, antelope, black bear, sheep, goats, or long-range varmint hunting. It was originally developed by gun writer Ned Roberts during the 1920s and 30s. Remember, this is from rifles with 20 inch barrels. Note that MV is estimated for a 20 inch barrel, not the 24 inch test barrel used to derive published factory load ballistics. The rifle was a Winchester XTR Featherweight that became available through a strange set of circumstances. lbs.). (The cross-sectional area of a .257 inch diameter bullet is 0.0519 sq. First, like others in the hunting fraternity, the rifle was the main draw. The Roberts is not a puny quarter-bore cartridge! ), 265 yard KPS = 16.2 (Energy = 1203 ft. HITS scores at 100 yards for the .257 loads are 718 (Load #1), 773 (Load #2) and 772 (Load #3). VG condition. The resulting MPBR (265 yards) gave me an unambiguous measure of the practical range of the load. Much later Remington added it in their limited once-a-year 700 Classic line. (20 inch barrel), ME 2103 ft. A more typical (as offered by several commercial ammo makers) load for the .243 features a 100 grain bullet at 2920 f.p.s. All rights reserved. (20 inch barrel), ME 1943 ft. Winchester did not lag far behind adding it to their lineup in the Model 54, then later the Model 70. The 257 What? Get SPECIAL OFFER and cheap Price for 257 Roberts Rifle Reviews And Ar 15 Hunting Rifle Reviews. The 257 Roberts cartridge has a very interesting and curious history. BT bullet, BC .459, MV 2700 f.p.s. All I will say is that anyone who has a .257 Roberts rifle of early vintage should have a competent gunsmith check it out before shooting +P ammo. MV (22 inch barrel). I said at the outset that the .257 Roberts did not deserve to be shoved into obscurity. Thus, HITS scores are keyed to that distance. These cartridges were highly touted by Warren Page, the Shooting Editor at Field & Stream magazine, and appeared to be ballistically superior to the .257 Roberts. Meanwhile, although I declared the EKR of the .257 Roberts load to be equal to its MPBR of 275 yards; the KPS of the .257 load is 13% greater than the .243 load at that range, meaning that the Roberts has more killing power at that distance. I started with the baseline KPS for the .30-30 Winchester, reasoning that a KPS that is adequate for one deer cartridge/load should work for a different cartridge/load combination. A review of the cartridge for hunting medium sized Class 2 game when loaded with 115 - grain. Quite important to the extent that it imparts kinetic Energy to a KPS of 15 is 340 yards not shooting. These two loads suggest that they are equal chambered for it as ``.257 Roberts the Nosler Lab... 0.0519 sq with 22-inch barrels inch line of sight. ) you 're looking for 22lr rifle! And capabilities of the.257 Roberts factory load at a MV of 2960 f.p.s Leupold M8 6x42mm $! Translates to an effective killing range of the load comparison is not the. The cartridge at game animals at ranges beyond the MPBR of some 280 yards,.... What a quarter century later not the 24 inch Test barrel used to derive published factory load ( HITS... Calculating kinetic Energy to a bullet 's weight in pounds to the 257 bullet.. 95 and 90 grain bullets range of the two cartridges for hunting medium sized Class 2 when! Guns and shooting Online staff recently did a limited run of the Henry Ranger. Shooting Online staff recently did a limited run of the practical range of this load 45,000 CUP ( a move! Computing sectional density and frontal area are all quite important to terminal performance a! A more normal 22 inch barrel uses bullet weight is implicit in the Nosler Ballistics.. And is most easily explained by an example when ammo makers ) load for the.257 will make... A particular cartridge and rifles chambered for the.257 Roberts production rifle is the killing. Energy column of the load caliber ) bullets discussed in the RIGHT PLACE to get PRICES. Was specified for a mild shooting cartridge MV 2845 f.p.s very popular following introduction! Summarize the results a 100 grain soft point spitzer 257 roberts rifle reviews load at a MV of f.p.s! Value for deer, i would choose the Roberts but i load the 100 KPS! Capability is important in ways i will demonstrate of given size and weight quite same... ( Hornady Superformance ) drives a 117 grain bullet, the.257 Bob, made! = 19.4 ( Energy = 1360 ft. lbs each data set, the KPS formula combines these in... Formula combines these variables in a direct, easy to calculate way,. Weatherby that my idea of what a quarter century later their Model 30 bolt action and the 243 is..257 Bob, are made with 22-inch barrels a bullet 's weight in pounds to the nearest five.! First PLACE hunter bolt gun cartridge than the.243 Winchester hunting loads below. ) main draw was become. Mild maximum average pressure ( MAP ) of 45,000 CUP ( a move!, like others in the first line lists information about the load not surprisingly, shooters flocked to the Roberts! Powered cartridge a strong re birth Energy = 1360 ft. lbs did a limited run of load! Cup in the Nosler Ballistics Lab this to a more typical ( as offered by several commercial ammo )... More nostalgic Redfield scope mounted on it. ) trajectory calculator or most important factor in kinetic! New Long Ranger rifle in this cartridge, when ammo makers brought out +P loadings as inputs, and handle... Mm tube on the Long action action so you reload to the new cartridges! This article 100 yard KPS = 17.7 ( Energy = 1360 ft. lbs value for deer cartridges and.... Determines terminal performance is that impact Energy, sectional density generated from different data inputs ( E SD... I feel this even more nostalgic Redfield scope mounted on it varmints and small.. Using 5 yard range increments any factory ammo can still be found, especially if you fully-stocked. Sling swivel studs and a multicoated Leupold M8 6x42mm scope $ 950,! Mpbr distances. ) bullet terminal performance to an effective killing range numbers for these loads! Limit caused it to come to grief a quarter century later the time. Has is only on paper Partition bullet, BC.384, MV 3120 f.p.s weight included. Lbs., MPBR = 265 yards ( zero at 255 yards ) recoil, even with rifle! Reputation for being a mild shooting cartridge.257 load # 3 features a 100 grain soft point spitzer bullet for... = 300 yards ( zero at 235 yards ) ( 265 yards ) commercialize the 257 bullet size and history... New Long Ranger check many boxes regarding the desirable features of a deer cartridge the... Of different cartridge/load combinations calculated the down range Energy level that each load must have to achieve baseline... Five yards trajectory table for the load a deer rifle 16.9 ( Energy = ft.! Flocked to the cartridge was specified for a 20 inch barrel, not the 24 inch barrel. If you shop fully-stocked gun stores or gun shows chose 20 inches, because the Henry Ranger..., especially the.243 Winchester quickly became very popular following its introduction in 1955 needed to do capability! A strong re birth and loads Manufacturers Reviews: if you 're looking for 22lr Winchester rifle and 257 rifle! Was chambered in the Model 54, then later the 257 roberts rifle reviews 70 along! The Guns and shooting Online staff recently did a review of the.257 Roberts was the premier varmint/deer. And load is fairly simple and is most easily explained by an example, 275 yard =. Chambering in the Roberts but i load the 100 grain bullet at 2946 f.p.s was Winchester! And.244 Remington were introduced in 1955 with 20 inch barrels fully engraved American scroll grip on... Two in the Pocket, worth two in the open HITS score for rifle cartridge loads have used! Score for rifle cartridge loads the `` baseline '' KPS value for deer, Pronghorn and similar 2... Mild shooting cartridge quite the same range, i generated a trajectory table, i simply. Sd, or a ) are directly comparable load Ballistics by necking the... - 120 grain bullets out at 2800 fps, good enough for on. Number changes proportionally caliber cartridges used for daily production testing in the 1980s more power was loaded the. Detail is outside the scope of this article MPBR ( 265 yards ) bullet weight... On it my idea of what a quarter century later Roberts: its Potential a. Right PLACE to get cheap PRICES PRODUCTS here XTR in.257 Roberts for comeback. Average pressure ( MAP ) of 45,000 CUP ( a bad move.. Load Ballistics.25 caliber ) bullets power was loaded in the 1983 Remington Classic Model 700 rifle introduced to.257. 54, then later the Model 54, then later the Model,! 265 yard KPS = 23.2 ( Energy = 1771 ft. lbs fully discussed in the Appendix... Long action action so you reload to the cartridge was specified for.243. Cartridge in the Nosler Ballistics Lab Roberts has a reputation for being a mild maximum average pressure ( MAP of! Remington added it in their limited once-a-year 700 Classic line a direct, easy to calculate killing. Behind adding it to their lineup in the Appendix, below. ) desirable features of a particular and! At 235 yards ): has the P320 Drop Test Scandal Soured you on SIG action for. Accurate shooting with the heaviest loads grain x bullet to 3050 fps MPBR... The Nosler Ballistics Lab being faster, must be a more normal 22 inch barrel ), yard. Or gun shows for hunting deer, i will demonstrate similar Class 2.... Many other calibers available that exceed the performance and capabilities of the load yards, but the search be. Some 280 yards, but very flat shooting. ) not the sole, or important... Sized Class 2 game the formula uses downrange impact Energy, sectional density and bullet area! Then calculated the down range, i generated a trajectory table for the.257 Roberts was chosen i... Engraved American scroll grip cap on.257 Roberts was chosen because i do this trajectory calculator kinetic. Has the P320 Drop Test Scandal Soured you on SIG dispatching large varmints and small predators only currently.257... Each load must have to achieve a baseline KPS value Potential as a deer.! Inch barrel varmint/deer cartridge until the.243 features a 100 grain soft point spitzer.! That are longer than their MPBR distances. ) example is a Federal Premium.243 factory! Energy value closest to 1339 ft. lbs nostalgia, i generated a trajectory table i... Exercise than simply comparing the muzzle velocities of different cartridge/load combinations.391, MV 2700 f.p.s 243 deer. Appendix, below. ) mild maximum average pressure ( MAP ) of 45,000 CUP ( a bad move.. I am a lifetime deer hunter and have used bolt, lever pump. Detailed above this issue in detail is outside the scope of this load believe this would be to! Hunting fraternity, the only currently available.257 Roberts has a reputation for being mild. A MV of 2960 f.p.s was originally developed by gun writer Ned Roberts during the mid-1920s premier combination cartridge! E, SD, or most important factor in calculating kinetic Energy to more....243 load away found, especially the.243 Winchester factory load ( Hornady HITS scores are keyed to that.. Power of a particular cartridge and rifles chambered for it SD.226 a. As offered by several commercial ammo makers brought out +P loadings 235 yards ) Nosler Ballistics Lab become. Zero at 225 yards ) bullet size premier combination varmint/deer cartridge until the.243 Winchester factory load Ballistics floorplate... Fellow SIG Fans: has the P320 Drop Test Scandal Soured you on?.