After fire-forming, follow load data for the .257 Roberts Ackley Improved. He chose the 7x57mm Mauser case to modify and, reportedly, tested myriad configurations before settling on the “perfect” .25-caliber varmint and deer cartridge. [9] The Ackley Improved was a typical change of a steeper shoulder coupled with blown-out sides for more of a straight cartridge, providing greater powder capacity. With heavier bullets it is capable of taking all but the largest North American game animals. The 257 Roberts Ackley Improved delivers great ballistic performance. To fire-form brass for the .257 Ackley Improved, we suggest the following procedure: Loaded for 257 Roberts Ackley Improved is Not offered at this time. This means you have the option to read your magazine on most popular phones and tablets. Designed for Loading & Reloading 257 Roberts Ackley Improved Brass is Not offered at this time. When Remington decided to adopt it as a factory cartridge in 1934, the company made a few minor dimensional changes to preclude firing factory ammo in rifles chambered for the wildcat round. *To fire-form brass, use the faster-burning powders and loads from standard .257 Roberts data. Plus, the primer pockets are still tight after at least three firings. Of course, you could have your rifle rechambered for the .25-06 Ackley which treads close on the heels of the .257 Weatherby, but I recommend having your standard Roberts long- throated which is what I did. 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.[3]. .257 Ackley Improved *Barnes loads were developed using brass fire-formed to fit the Ackley Improved chamber. All Shooting Times subscribers now have digital access to their magazine content. Seat the bullet well out into the rifling, so that it makes good contact with the lands when the cartridge is chambered. At the time there were many older actions available of questionable strength. I want to make readers aware of one special step that’s required when handloading the .257 AI. That allows you to safely fire factory cartridges in the modified chamber. Winchester introduced a +P version with a MAP of 58,000 psi in the mid-1980s. The bore diameter of the .257 Roberts is .250 inches (6.35 mm) making it a ".25"/6.35 mm caliber", not to be confused with the more well known 6.5 mm caliber which uses 6.7 mm/.264" bullets or the slightly less common 6mm caliber Which uses 6.1mm/ .243” bullets. Conversion of war-souvenir Japanese Arisaka rifles, Learn how and when to remove this template message, "Accurate Powder Reloading Data Guide, 5th ed", https://www.americanrifleman.org/articles/2013/7/19/a-classic-returns-in-257-bob/, The .257 Roberts (.257 Roberts +P) by Chuck Hawks, "SAAMI Velocity & Pressure Data: Centerfire Rifle", "Nosler Reloading Guide 7, 250-3000 Savage", "Nosler Reloading Guide 7, 257 Roberts Ackley Improved", .257 Roberts (257 Roberts +P) at The Reload Bench, https://en.wikipedia.org/w/index.php?title=.257_Roberts&oldid=976100834, Articles needing additional references from August 2015, All articles needing additional references, Creative Commons Attribution-ShareAlike License, .257 Roberts (+P), .257 Roberts Ackley Improved, This page was last edited on 1 September 2020, at 06:11. You must anneal the case neck/shoulder to ensure maximum case life. However, an even more important feature of the typical Ackley Improved (AI) wildcat is that he maintained the shoulder headspace datum of the parent factory round. The other prominent version is the .257 RCBS Improved, which features a 28° shoulder. Ackley said that the .257 Roberts Ackley Improved was probably the most useful all-around cartridge. Japanese Type 38 Arisaka rifles brought to the United States as wartime souvenirs were sometimes converted by rechambering to utilize more readily available .257 Roberts cartridge cases because commercially produced 6.5×50mm Arisaka cartridges were scarce prior to distribution by Norma Projektilfabrik A/S. We manufacture hunting, competition, defense, handgun, target, match, lead-free; reloading components and accessories. James Tarr runs through the 3-Second Headshot drill. Eventually in 1934 Remington Arms chose to introduce their own commercial version of such a cartridge, and although it wasn't the exact dimensions of the wildcat made by Roberts, they called it the .257 Roberts.[4]. According to P.O. Handgun shotshells are more complicated than one might think. Data for muzzle velocity and muzzle energy is for a 24" barrel, except .250-3000 Savage which is for a 22" barrel and .257 Weatherby Magnum which is for a 26" barrel. The .257 Roberts was pretty popular for a few years before and after World War II, but when the 6mm wildcats gained Winchester’s and Remington’s attention in the mid-1950s, the fate of the .257 Roberts was sealed. At the time there were many older actions available of questionable strength. I followed Nosler’s instructions shown in its No. Because of its size, the 7×57mm Mauser case was a common choice, having near the ideal volume capacity for the "quarter-bore" (called this because the .25 caliber is one quarter of an inch) using powders available at that time. While there are several versions of .257 Improved, this load data is intended for use in firearms chambered for the .257 Roberts Ackley Improved (40° shoulder angle). Later, when I measured water capacities of a standard .257 Roberts case and several fireformed AI cases, the difference was about 13 percent (60 grains compared to 53 grains of water). 107 SW Columbia St | Bend, Oregon, USA 97702  |  Toll Free: 1-800-285-3701  |  catalog@nosler.comNosler Showroom / Open to the Public:  Monday - Friday 10:00 am to 5:30 pm PSTCorporate Hours:  Monday - Friday 8:00 am to 4:30 pm PST, Copyright 2013 - 2020Nosler Inc  |  Privacy  Use  Order Processing, Nosler - Bullets, Brass, Ammunition & Rifles. ©2020 Outdoor Sportsman Group. After having the rifle rechambered; picking up a set of reloading dies; gathering an adequate supply of bullets; and researching load data from Hodgdon, Sierra, Hornady, and Western, I fireformed three boxes of brass, loaded a half-dozen different handloads with the bullets seated out just short of the throat leade, and test-fired them. I embarked on my .257 AI project almost by accident. Subscriber Services. Early articles by Townsend Whelen and Jack O’Connor proclaimed the virtues of the .257 Roberts in the hunting fields. The current SAAMI spec for the .257 Roberts Maximum Average Pressure (MAP) is 54,000 psi. A few issues back, two Shooting Times readers expressed interest in reading about wildcat cartridges and the adventurous experimenters who created them. Select a light load of relatively fast powder (IMR4895 is great) from the standard .257 Roberts data. Obviously, when fireforming factory ammo in a modified rifle, you can’t anneal the brass initially; however, you should anneal new brass before fireforming and once-fired cases before reloading them. The two most popular "Improved" .257 Roberts cartridges are the Ackley and RCBS versions. Many cartridge designers in the 1920s were creating various .25 caliber cartridges. All Rights Reserved. From its introduction until the appearance of more popular 6 mm cartridges such as .243 Winchester and 6mm Remington, it was a very popular general purpose cartridge. The .25-06 which holds another 8 or 9 grains of powder outperforms the .257 Ackley by about 200fps. While thinning out my firearms inventory, I realized I could convert my Ruger Hawkeye bolt-action rifle chambered for .257 Roberts to .257 AI. I purposely tested conservative handloads, so I suspect there’s room for enhancing the ballistics. Ned Roberts is usually credited with being the designer for this cartridge idea. 8 reloading manual and achieved excellent results. The modified Roberts cases are sometimes known as 6.5×.257 Roberts, although the case headstamp may still indicate .257 Roberts. To get started, click the link below to visit mymagnow.com and learn how to access your digital magazine. You can bet that I’ll be experimenting further with bulletseating depth, charge weights, etc. That’s still less than the typical 60,000 to 65,000 psi of comparable modern rifle cartridges. Next, we pit subsonic rivals against each other before stretching the legs of this CQB round out to 600 yards from a short 9-inch barrel. The .257 Roberts, also known as .257 Bob,[2] is a medium-powered .25 caliber cartridge. The original factory load for this is very similar to the .250-3000 Savage. When handloading rifle cartridges with blackpowder, Allan suggests you should not approach it... By cleverly increasing the parent cartridge's powder capacity, the .30-06 Ackley Improved... Give a Gift   With a modern action and handloading, this cartridge is capable of markedly improved performance. |   *To properly chamber a rifle for .257 Ackley Improved cartridges, a gunsmith must set the original barrel back about 0.004”. This holds the case head against the bolt face and eliminates case stretching in the web area, a cause of case head separation. The neck of the Roberts case would be slightly enlarged to accept handloaded 6.5 mm bullets. I was pleased with the ballistics, and I lost only one case. They are quite similar except for the shoulder angle, which is 40 degrees for the Ackley version and 28 degrees for the RCBS version. Tom Beckstrand and Neal Emery of Hornady highlight the 6MM Creedmoor ammo. Improved delivers great ballistic performance is great ) from the standard.257 Maximum! Suitable for varmint hunting popular `` Improved ''.257 Roberts the 6MM Creedmoor.! Taking all but the largest North American game animals trajectory suitable for varmint hunting Creedmoor ammo this means you the..., this cartridge is capable of taking all but the largest North American game animals Connor the! Is great ) from the standard.257 Roberts in the 1920s and 30s. 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Click the link below to visit mymagnow.com and learn how to access your digital.. Are sometimes known as.257 Bob, [ 2 ] is a medium-powered.25 caliber cartridges eliminates stretching! New factory round the.257 RCBS Improved, which features a 28° shoulder the current SAAMI for... 65,000 psi of comparable modern rifle cartridges magazine content recent handloading project with ballistics.

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