257 roberts reloading data
.257 Roberts reloading data with 91 loads. Using bullets from Hornady HP, Barnes TTSX BT, Hornady GMX, Sierra HPBT, Speer SPBT, Nosler Part. Powders include IMR
The .257 Roberts started life as a wildcat, devised by gunwriter and tinkerer Ned Roberts in the 1920s who tried his hand at necking down a case to shoot a smaller bullet. The idea, as always, was to decrease recoil and gain ballistic advantage through sheer velocity. The parent case is 7x57mm Mauser.
May 20, 2023 ... I've shot one box and reloaded it with 100 gr spitzers. The two targets show 6 rounds of the factory ammo and 6 of the hand loads.Reloading Costs Calculator; Case Crimp Calculator; Energy, Momentum, Power Factor, and Taylor Knock-out Calculators ... About / Support; Disclaimer; Contact; Log in / Sign up. Manufacturer Loading Data Popular Cartridges.17 Ackley Hornet.17 Hornet.17 Remington.204 Ruger.22 - 250 Remington.22 ARC (Advanced Rifle Cartridge) ... .257 …Warning! Notes: case: Remington; bbl: 24"; pr: Remington 9 1/2; NEVER exceed loads listed. Be Alert: Publisher cannot be responsible for errors in published load data. Wt. .257 Roberts (IMR Data) reloading data with 11 loads. Using bullets from Sierra SP, Sierra Hollow Point Boat Tail. Powders include IMR.I am shooting a 20" suppressed Ruger Hawkeye chambered in 257 Roberts. I have had real good luck and accuracy with both IMR and H 4831. I load Nosler bullets at 100grn, 110grn, 115grn and 120grn slugs and get good accuracy with all weights. I used the Hogdon reloading data to get a starting point and worked up from there..257 Roberts (Cast Bullet Loads) reloading data with 9 loads. Using bullets from Lyman 257463, Lyman 257464, Lyman 257235. ... .257 Roberts (Cast Bullet Loads) Warning! Notes: Handloader Issue 130: Be Alert: Publisher cannot be responsible for errors in published load data. Wt. Bullet: Powder Manufacturer: Powder: Charge: Velocity (FPS) …
Dec 9, 2014 ... 2- Used H4895, which Hodgdon discusses on their site in the reloading data section. Essentially, you can take the max book charge on a given ... Today we're choosing a load and we're going to select our bullet, powder, brass, and primer. And we're not just choosing a load for accuracy but a lot that w... .257 Roberts Reloading Data (Using Hornady Bullets) reloading data with 307 loads. Using bullets from Hornady FP, Hornady V-Max or HP, Hornady SP, Hornady GMX, Hornady IB, Hornady SST, BTSP or RN, Hornady HP. Powders include Accurate, Hodgdon, Alliant, IMR, Vihtavuori, Winchester. .257 Roberts Improved Data reloading data with 40 loads. Using bullets from Hornady, Sierra HP, Rem. Power Lokt, Sierra, Hornady Spire Point, Hornady Round Nose, Barnes. May 11, 2022 · The .257 Roberts was the only rifle cartridge to receive this designator, and the +P status increased its maximum average pressure (MAP) from 54,000 psi to 58,000 psi. For comparison, the .30-06 has a MAP of 60,000 psi. Functionally, ammomakers slightly beefed-up the Roberts case walls near the head.
Safety Data Sheets; Shipping & Delivery; Warranty; Login 0. 0. My Cart. 0. 0. Search suggestions. Site Search. Cartridge Selector (Tap to open) ... .257 ROBERTS IMPROVED 40° RELOADING ESSENTIALS .257 ROBERTS RELOADING ESSENTIALS .257 WEATHERBY MAGNUM RELOADING ESSENTIALS .25 AUTO (25 ACP) … 45 Caliber / .451” Diameter. 45 Auto (ACP) 45 Colt (Single Action Army & Replicas) 45 Colt (Ruger & T/C Contender & Encore) Explore the world of Nosler, renowned for crafting the finest bullets, ammunition, rifles, and brass. Discover our extensive lineup, including Partition, AccuBond, E-Tip, Ballistic Tip, Custom Competition, and more. .257" 25 Spitzer SP Hot-Cor® 25 HP 25 Spitzer BTSP Weight (grains) 100 ... Refer to the current SPEER® Reloading Manual for handloading instructions. Be ... 257 Roberts +P 3064 3113 3110 3094 3091 3055 3053 3050 3030 3023 2944 2871 2842 2807 MAXIMUM CHARGE Muzzle Velocity (feet/sec) 2878I have a Howa 1500 that has been rebarreled by E.R.Shaw to .257 Roberts with a 24" magnum contour barrel with 1:10 twist. It is topped with a Weaver V10 scope in Leupold mounts. I'm planning to make this my main deer rifle and hopefully print tiny groups with it too. I'm planning to use heavier bullets of 110-120 grains at modest velocity, 2600 ....257 Roberts (Hodgdon Data) reloading data with 122 loads. Using bullets from Hornady SP, Hornady HP, Barnes TTSX BT, Hornady GMX, Sierra HPBT, Speer SPBT, …
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The .257 Roberts has a maximum average pressure of 54,000 psi and can be loaded with bullet weights ranging from 75 to 120 grains. It is commonly used for hunting deer, antelope, and other similar-sized game, as well as varmints. The popularity of the .257 Roberts has declined in recent years, with many hunters opting for newer cartridges that ....257 Roberts (Hornady Handbook of Cartridge Reloading 7th & 8th Editions) reloading data with 0 loads. Using bullets from . Powders include ... 22 inch, 1 in 10 inch Twist; case: Hornady/Frontier; primer: Winchester WLR; bullet diameter: 0.257 inches; maximum C.O.L.: 2.780 inches; max. case length: 2.233 inches; case trim length: 2.223 inches ....257" 25 Spitzer BTSP Weight (grains) 120 Ballistic Coefficient 0.480 Sectional Density 0.260 COAL Tested 2.770" Speer Part No. 1410 Propellant Case Primer Weight (grains) Muzzle Velocity (feet/sec) Weight (grains) Alliant Power Pro 4000-MR Federal Federal 210 40.2 2589 44.7 Alliant Reloder 23 Federal Federal 210 41.2 2608 45.8 C.257 Roberts Handloads +P Pressure reloading data with 31 loads. Using bullets from Hornady Spire Point, Barnes TSX FB, Hornady SST, Sierra softpoint, Speer softpoint. Powders include IMR, Winchester, Hodgdon, Vihtavuori, Alliant, Ramshot, Norma, Accurate2,694. Remarks: .257 Roberts Ackley Improved (Using Nosler Bullets) reloading data with 135 loads. Using bullets from Nosler Ballistic Tip or CT Ballistic Silvertip , Nosler Ballistic Tip or CT Ballistic Silvertip, Nosler Ballistic Tip, E-Tip or Partition Spitzer, Nosler Accubond, Nosler Ballistic Tip, CT Ballistic Silvertip or Pa, Nosler ...Notes: Test rifles: prewar Model 70 (24-inch barrel) and 1981 Model 70 Featherweight (22-inch barrel). (Handloader Issue 94) Be Alert: Publisher cannot be responsible for errors in published load data. Wt. .257 Roberts (Pet Loads Update) reloading data with 67 loads. Using bullets from Sierra HP, Hornady HP, Speer Sp, Sierra Sp, Hornady SP ...
Mar 10, 2011 ... Looking for loads for a 257 Roberts, the rifle is used for elk, deer, and antelope. Thinking a 110gr Nosler ACCU-bond or 100gr Partition will be ...It is considered to be about the maximum capacity for the .25 bore and still produce satisfactory performance and good barrel life. The Improved .257 can be readily recommended. (Handbook for Shooters & Reloaders/Vol. 1 - P.O. Ackley, 1962) NOTE: USE THIS DATA WITH EXTREME CAUTION. Be Alert: Publisher cannot be responsible for errors in ... 257 Rob +P - 100 grain Version 9.0 4" Lilja BARREL Twist 1-10" Expansion Tip® 0 .4 0 9 D u e to in te rn al co n stru ctio n d i˜ e re n ce s, alw ays b e g in w ith startin g lo ad s w h e n u sin g Exp an sio n Tip ® products. 81% 96% 72% 92% 81% 7% This data was developed to the 257 Roberts +P pressure level of 58,000 psi, and should only Mar 8, 2004 · Well, I'm about three weeks into reloading for the .257 Roberts +P. So far I have three good loads worked up and have loaded but not test-fired another batch. The results so far: Common components. Win brass, CCI 250 primer. 75g Hornady VMAX. COL 2.8025". 42.0g Varget. 3187fps, 7.0fps STD, 16fps E.S. 2,744. Remarks: 0.93 inch. .257 Roberts, 22-Inch Barrel reloading data with 14 loads. Using bullets from Hornady hollowpoint, Sierra hollowpoint, Hornady pointed softnose, Sierra pointed softnose, Nosler Partition, Nosler Ballistic Tip, Hornady spitzer boat-tail, Sierra spitzer boat-tail, Remington roundnose, Hornady roundnose, Speer spitzer ...Warning! Barrel Length: 24 inches; Primer: Federal 210; Source: Handloader Magazine issue #306 February-March 2017. Be Alert: Publisher cannot be responsible for errors in published load data. Wt. .257 Roberts (using Alliant's RL-16) reloading data with 2 loads. Using bullets from Nosler Ballistic Tip, Hornady SST..257 Roberts Handloads Standard Pressure reloading data with 40 loads. Using bullets from Hornady Spire Point, Berger HP, Barnes TSX FB, Hornady SST, Sierra softpoint, Speer softpoint. Powders include IMR, Winchester, Hodgdon, Vihtavuori, Alliant, Accurate, Ramshot, NormaRemarks: max load; COL: 2.775"; 45,000 cup. .257 Roberts reloading data with 91 loads. Using bullets from Hornady HP, Barnes TTSX BT, Hornady GMX, Sierra HPBT, Speer SPBT, Nosler Part. Powders include IMR. WLR; min. OAL (inches): 2.775; case: Win. bbl length: 24. Be Alert: Publisher cannot be responsible for errors in published load data. Wt. .257 Roberts +P (Alliant Data) reloading data with 4 loads. Using bullets from Sierra HP, Speer Spitzer, Sierra HPBT. Powders include Alliant.
The .257 Roberts Improved. The two most popular "Improved" .257 Roberts cartridges are the Ackley and RCBS versions. They are quite similar except for the shoulder angle, which is 40 degrees for the Ackley version and 28 degrees for the RCBS version. The Hornady Handbook and Nosler Reloading Guide show maximum reloads for the .257 Improved ...
The .257 Roberts was the premier combination varmint/deer cartridge until the .243 Winchester and .244 Remington were introduced in 1955. 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.25 Caliber Neck Sizer Die - 250 Savage, 257 Roberts, 25-06 Remington, 257 Weatherby Magnum. 005-046042 | Hornady. $34.15. In Stock. 257 Roberts Full Length Series III 2 Die Set With Zip Spindle. 005-546274 | Hornady. $63.81. In Stock. 257 Roberts Full Length Pacesetter 3 Die Set With Shellholder.Reloading Costs Calculator; Case Crimp Calculator; Energy, Momentum, Power Factor, and Taylor Knock-out Calculators ... About / Support; Disclaimer; Contact; Log in / Sign up. Manufacturer Loading Data Popular Cartridges.17 Ackley Hornet.17 Hornet.17 Remington.204 Ruger.22 - 250 Remington.22 ARC (Advanced Rifle Cartridge) ... .257 …Find the optimal bullet, gunpowder and charge weight for reloading 257 Roberts ammunition from Norma. Compare the velocities and MRPs of different bullets and … 45 Caliber / .451” Diameter. 45 Auto (ACP) 45 Colt (Single Action Army & Replicas) 45 Colt (Ruger & T/C Contender & Encore) Explore the world of Nosler, renowned for crafting the finest bullets, ammunition, rifles, and brass. Discover our extensive lineup, including Partition, AccuBond, E-Tip, Ballistic Tip, Custom Competition, and more. .257 Roberts - Published Manufacturer Loading Data Shellholders: Hornady #1Reloading Costs Calculator; Case Crimp Calculator; Energy, Momentum, Power Factor, and Taylor Knock-out Calculators ... About / Support; Disclaimer; Contact; Log in / Sign up. Manufacturer Loading Data Popular Cartridges.17 Ackley Hornet.17 Hornet.17 Remington.204 Ruger.22 - 250 Remington.22 ARC (Advanced Rifle Cartridge) ... .257 …
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257 Roberts Ackley Improved Load Data. 85 Grain. 100 Grain. 110 Grain. 115 Grain. 120 Grain. Explore the world of Nosler, renowned for crafting the finest bullets, ammunition, rifles, and brass. Discover our extensive lineup, including Partition, AccuBond, E-Tip, Ballistic Tip, Custom Competition, and more. Experience superior quality and ...The .257 Roberts Improved. The two most popular "Improved" .257 Roberts cartridges are the Ackley and RCBS versions. They are quite similar except for the shoulder angle, which is 40 degrees for the Ackley version and 28 degrees for the RCBS version. The Hornady Handbook and Nosler Reloading Guide show maximum reloads for the .257 Improved ... .257 Diameter Bullets 75 gr. HP 87 gr. SPT 90 gr. HPBT 100 gr. SPT 100 gr. SBT 117 gr. SBT 117 gr. SPT 120 gr. HPBT.264 Diameter Bullets 85 gr. HP 100 gr. HP 120 gr. SPT According to Philip B. Sharpe’s classic book Complete Guide to Handloading (Third Edition, Second Revision), listed the specs for the .257 Roberts were an 87-grain bullet at 3100 fps, a 100-grain bullet at 2800 fps and a 117-grain bullet at 2550 fps. The round nosed 117-grain bullet was a good choice for deer and similar-sized game, but …2,694. Remarks: .257 Roberts Ackley Improved (Using Nosler Bullets) reloading data with 135 loads. Using bullets from Nosler Ballistic Tip or CT Ballistic Silvertip , Nosler Ballistic Tip or CT Ballistic Silvertip, Nosler Ballistic Tip, E-Tip or Partition Spitzer, Nosler Accubond, Nosler Ballistic Tip, CT Ballistic Silvertip or Pa, Nosler ...Remarks: mid range load; COL: 2.705"; 27,800 psi. .257 Roberts Youth / Reduced Loads (Accurate Data) reloading data with 4 loads. Using bullets from Lead GC, RCBS Lead GC. Powders include Accurate. The .257 Roberts is one of those cartridges that has a storied history in cartridge development. Noted gun and cartridge experimenter – Dr. Franklin Mann – was indeed a very important part of the .25-caliber concept. Ned Roberts of New Hampshire was the other part, and in fact was the deciding factor of a host cartridge later to bear his name. Load Data for .257 Roberts . Bullet: 115 gr PART (NOS) Diameter: 0.257" Powder: StaBALL 6.5 (Winchester) Starting Powder: 38.5 gr. Max Powder: 43.0 gr .Discounted fares to San Juan are available for much of this year on American Airlines for under $300 round trip. Puerto Rico is home to many historical landmarks from forts to cath.../r/Reloading is a place for civilized discussions on the topic of Metallic and Shotshell reloading ... Best loads for 257 roberts with 117gr hornady sst h380 powder nosler +p brass and cci LR 200 primers . 10 years ago I made some loads that shot 1moa out of my M77 I lost the load data and am trying to make some loads like that again i have the ...Oct 11, 2022 ... .257 Roberts is a good cartridge for deer. Had a friend kill 25 whitetails with the first and only rifle that he owned, a .257 Roberts.60. Location. Fernandina Beach. That is interesting, and probably has something to do with the 257 Roberts being the only rifle cartridge that later had a +P designator. I currently don’t own a Roberts, but have loaded for 5 of them. All preferred H4350 and a good 100 gr bullet, such as the TSX or Nosler BT. ….
.257 Roberts (Alliant Reloaders Guide 2008) reloading data with 4 loads. Using bullets from Sierra HP, Speer Spitzer, Sierra BTHP. ... .257 Roberts (Alliant Reloaders Guide 2008) ... Be Alert: Publisher cannot be responsible for errors in published load data. Wt. Bullet: Powder Manufacturer: Powder: Charge: Velocity (FPS) 75: Sierra HP: Alliant ...It is considered to be about the maximum capacity for the .25 bore and still produce satisfactory performance and good barrel life. The Improved .257 can be readily recommended. (Handbook for Shooters & Reloaders/Vol. 1 - P.O. Ackley, 1962) NOTE: USE THIS DATA WITH EXTREME CAUTION. Be Alert: Publisher cannot be responsible for errors in ... Today we're choosing a load and we're going to select our bullet, powder, brass, and primer. And we're not just choosing a load for accuracy but a lot that w... Mar 8, 2004 · Well, I'm about three weeks into reloading for the .257 Roberts +P. So far I have three good loads worked up and have loaded but not test-fired another batch. The results so far: Common components. Win brass, CCI 250 primer. 75g Hornady VMAX. COL 2.8025". 42.0g Varget. 3187fps, 7.0fps STD, 16fps E.S. Load data with 94 loads for .257 | 100gr | Sierra SPT Pro-Hunter bullet in caliber .257 Roberts Wt. .257 Roberts reloading data with 8 loads. Using bullets from Sierra jacketed hollowpoint, Hornady jacketed hollowpoint, Speer jacketed hollowpoint, Nosler Solid Base, Nosler Partition, Sierra spitzer boat-tail, Hornady hollowpoint. Powders include IMR, Norma, Hodgdon, Winchester. Dec 30, 2020 ... In a cartridge-era dominated by data tables filled with racy exterior ballistics, is there any room for modesty anymore?Reloading data for 257 Roberts. Bullet: Hornady SP 87 gr: Bullet weight: 5.6 g / 87 gr: B.C: 0.322: C.O.L: ... Reloading Governmental News Languages Close language ... Gunpowder Charge Weight Velocity m/s Velocity fps; Norma MRP: Max 49.9 Min 47.0: 923 864: 3028 2835 257 roberts reloading data, .257 Roberts Ackley Improved Data reloading data with 4 loads. Using bullets from Hornady V-Max, Barnes XLC, Nosler Ballistic Tip, Nosler Partition. Powders include Ramshot, Hodgdon, Accurate, Alliant , We place limited powder inventory for sale on a regular basis on our website. When we are sold out, we are sold out. We do not take backorders and our Tech Services team cannot take orders via email or phone. The max order quantity of any powder SKU is 5 and we will only accept one order, per customer, per calendar month with a maximum weight ..., Load Data for .257 ROBERTS ACKLEY IMPROVED . Bullet: 75 gr HP (Sierra) Diameter: 0.257" Powder: 4350 (Accurate) Starting Powder: 49.5 gr. Max Powder: 55.0 gr ., Load Data for .257 Roberts. Bullet: 80 gr TTSX BT (Barnes) Diameter: 0.257" Powder: IMR 4451 (Improved Military Rifle) Starting Powder: 43.2 gr. Max Powder: 48.6 gr. Primer: …, May 31, 2021 ... The Late .257 Roberts ... Hopeful Ballistics•1.5K views · 10:53 · Go to ... 257 Roberts varmint load Satterlee ladder test - Ruger M77 tang safety., .257 Roberts reloading data with 91 loads. Using bullets from Hornady HP, Barnes TTSX BT, Hornady GMX, Sierra HPBT, Speer SPBT, Nosler Part. Powders include IMR , Utah. QuickLOAD agrees with the others that 45.5g is WAY over pressure for the standard 257 Roberts. With a 24" barrel and a COAL of 2.775" the estimated pressure is 67,220 psi with 3,081 fps estimated muzzle velocity. QuickLOAD predicts that 41.5g to be max with that combo (@ 2.775" COAL & 24" barrel) for 2,822 fps., Today we're choosing a load and we're going to select our bullet, powder, brass, and primer. And we're not just choosing a load for accuracy but a lot that w... , .257" 25 Spitzer SP Hot-Cor® 25 HP 25 Spitzer BTSP Weight (grains) 100 Ballistic Coefficient 0.334 0.263 0.393 Sectional Density 0.1260.216 COAL Tested 2.770"2.760" Speer Part No. 1405 1407 1408 Propellant Case Primer Weight (grains) Muzzle Velocity (feet/sec) Weight (grains) Winchester 760 Winchester CCI 250 41.0 2804 45.0, The history of the .257 Roberts dates back to the 1920's, when a wildcatter by the name of Ned Roberts began to experiment with the .257” caliber. It has been suggested that Charles Newton persuaded Roberts to settle on the 7x57 case design and that close friend Col. Townsend Whelen suggested a 15 degree shoulder., Load Data for .257 Roberts. Bullet: 120 gr HPBT (Sierra) Diameter: 0.257" Powder: IMR 4350 (Improved Military Rifle) Starting Powder: . Max Powder: 41.5 gr. Primer: REM 9½. Case: REM. Trim Length: 2.223" Cartridge Overall Length: 2.775" Starting Velocity: Starting Pressure: Max Velocity: 2,780. Max Pressure: 45,000 CUP., Never will understand folks fishing for reloading data on the Internet. There are so many documented loads out there, if you search even a little bit. ... Accuracy has come at the top of the loading charts for my 30.06 with 168g bullets and .257 Roberts with 75g bullets with 760. The sensitivity issue concerns me now that I read about it. I'll ..., Load Data for .257 Roberts . Bullet: 80 gr TTSX BT (Barnes) Diameter: 0.257" Powder: IMR 4451 (Improved Military Rifle) Starting Powder: 43.2 gr. Max Powder: 48.6 gr ., For those wondering why I would suggest using 6.5mm Swedish Mauser loading data to load a 6.5mm x 57 (or more precisely, a necked up .257 ..., Loading Data . Warning; ... Reloading Costs Calculator; Case Crimp Calculator; Energy, Momentum, Power Factor, and Taylor Knock-out Calculators ... .257 Roberts ..., 222 Remington Magnum. 22-250 Remington. 223 Remington. 243 Winchester. 25-06 Remington. 257 Roberts +P. 26 Nosler. 260 Remington. 264 Winchester Magnum., The .257 Roberts was the premier combination varmint/deer cartridge until the .243 Winchester and .244 Remington were introduced in 1955. 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., NORMA wants to contribute to development and therefor we share approved reloading data for handloading with every caliber. Learn more about hand loading here! Norma Academy; Products; Reloading; Governmental; ... 257 ROBERTS. 25-06 REMINGTON. 257 WEATHERBY MAGNUM. 6,5 JAPANESE ARISAKA. 6,5 CARCANO. 6,5x54 M-S. …, Warning! Notes: .257 Roberts, Ruger M-77 long action 24-inch barrel; Remington cases, 186 grains; CCI No. 200 primers; Oehler M-31 Chronotach, Oehler M-50 photoelectric screens; velocity at 15 feet converted to MV; temperature 70 degrees; this rifle had a rather loose chamber and would handle more powder than most rifles with every bullet ..., Printed from Shooter's Reference on 05/03/2024: https://www.shootersreference.com/reloadingdata/257-roberts/, 257 Rob +P - 120 grain Version 9.0 24" Lilja BARREL Twist 1-10" GRS. POWDER CHG. 0.391 69% 64% 69% 75% 6% ** = Compressed load “ Because Nosler, Inc. has no control over the actual components selected, the manner in which they are assembled or the condition of the firearm used, no responsibility, either expressed or implied is assumed for the ..., 257 Rob +P - 100 grain Version 9.0 4" Lilja BARREL Twist 1-10" Expansion Tip® 0 .4 0 9 D u e to in te rn al co n stru ctio n d i˜ e re n ce s, alw ays b e g in w ith startin g lo ad s w h e n u sin g Exp an sio n Tip ® products. 81% 96% 72% 92% 81% 7% This data was developed to the 257 Roberts +P pressure level of 58,000 psi, and should only , The current SAAMI spec for the .257 Roberts Maximum Average Pressure (MAP) is 54,000 psi. Winchester introduced a +P version with a MAP of 58,000 psi in the mid-1980s. That’s still less than the typical 60,000 to 65,000 psi of comparable modern rifle cartridges. The .257 Roberts was pretty popular for a few years before and after World …, The .257 Roberts has (finally) been updated to piezoelectric pressure measurements, with standard pressure loads listed at 54,000 psi while +P loads are listed at 58,000 psi. The maximum loads in the accompanying data are almost all +P pressures. However, for handloaders wanting standard pressure data, starting and maximum loads should be ..., .257 Roberts in a 24-inch Barrel reloading data with 10 loads. Using bullets from . Powders include Winchester, IMR ... .257 Roberts in a 24-inch Barrel: Warning! Notes: Handloader Issue 130: Be Alert: Publisher cannot be responsible for errors in published load data. Wt. Bullet: Powder Manufacturer: Powder: Charge: Velocity (FPS) 90 ..., It is considered to be about the maximum capacity for the .25 bore and still produce satisfactory performance and good barrel life. The Improved .257 can be readily recommended. (Handbook for Shooters & Reloaders/Vol. 1 - P.O. Ackley, 1962) NOTE: USE THIS DATA WITH EXTREME CAUTION. Be Alert: Publisher cannot be responsible for errors in ..., The .257 Roberts Improved. The two most popular "Improved" .257 Roberts cartridges are the Ackley and RCBS versions. They are quite similar except for the shoulder angle, which is 40 degrees for the Ackley version and 28 degrees for the RCBS version. The Hornady Handbook and Nosler Reloading Guide show maximum reloads for the .257 Improved ..., Load Data for .257 ROBERTS ACKLEY IMPROVED . Bullet: 75 gr HP (Sierra) Diameter: 0.257" Powder: 4350 (Accurate) Starting Powder: 49.5 gr. Max Powder: 55.0 gr ., Reloder 16. Select A Caliber or Gauge Below To View Recipes. 243 Win. 25-06 Rem. 257 Roberts. 260 Rem. 270 Win. 270 Win. Short Magnum., The .257 Roberts Improved. The two most popular "Improved" .257 Roberts cartridges are the Ackley and RCBS versions. They are quite similar except for the shoulder angle, which is 40 degrees for the Ackley version and 28 degrees for the RCBS version. The Hornady Handbook and Nosler Reloading Guide show maximum reloads for the .257 Improved ..., 6.5x257 Roberts: Warning! Notes: rifle: Japanese type 38 (rechambered); barrel: 24"; twist: 1-8 3/8; cases: R-P; primer: CCI-200 (except where otherwise specified in remarks); data for 87 grain Spitzer bullet may be used with the 87 grain Hollow Point; this data may be used to load 6.5x57mm Mauser; maximum loads listed should be used with caution (Speer …, .257 Roberts Handloads Standard Pressure reloading data with 40 loads. Using bullets from Hornady Spire Point, Berger HP, Barnes TSX FB, Hornady SST, Sierra softpoint, Speer softpoint. Powders include IMR, Winchester, Hodgdon, Vihtavuori, Alliant, Accurate, Ramshot, Norma, All loads in Winchester Super Speed cases, overall length was 3.015 inches. (Rifle Issue 108 - November, 1986) Be Alert: Publisher cannot be responsible for errors in published load data. Wt. .257 Roberts Ackley Improved reloading data with 13 loads. Using bullets from Sierra, Sierra B.T., Speer. Powders include IMR, Hodgdon, Norma.