At the time there were many older actions available of questionable strength. The other prominent version is the .257 RCBS Improved, which features a 28° shoulder. 8 reloading manual and achieved excellent results. The .300 Blackout is here to stay, and we take some time to look at new technology surrounding this cartridge. Ackley, the modified 257 Roberts was likely the best improved round compared with the couple dozen or so factory cartridges he’d experimented with Ackley’s signature case modifications included reducing the body taper and increasing the shoulder angle—both significantly! [4], One of the common improvements is called the .257 Roberts(+P) which has a SAAMI maximum pressure limit of 58,000 PSI compared to the 54,000 PSI listed for the standard .257 Roberts.[8]. All Shooting Times subscribers now have digital access to their magazine content. 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. 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 I embarked on my .257 AI project almost by accident. Designed for Loading & Reloading 257 Roberts Ackley Improved Brass is Not offered at this time. The Remington part of the moniker was eventually dropped. Many cartridge designers in the 1920s were creating various .25 caliber cartridges. Ackley said that the .257 Roberts Ackley Improved was probably the most useful all-around cartridge. They are quite similar except for the shoulder angle, which is 40 degrees for the Ackley version and 28 degrees for the RCBS version. This holds the case head against the bolt face and eliminates case stretching in the web area, a cause of case head separation. With a modern action and handloading, this cartridge is capable of markedly improved performance. 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. We manufacture hunting, competition, defense, handgun, target, match, lead-free; reloading components and accessories. 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. He chose the 7x57mm Mauser case to modify and, reportedly, tested myriad configurations before settling on the “perfect” .25-caliber varmint and deer cartridge. Winchester introduced a +P version with a MAP of 58,000 psi in the mid-1980s. Like situational ethics, standards of accuracy vary according to circumstances. 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. With light bullets the .257 produces little recoil and has a flat trajectory suitable for varmint hunting. 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. Select a light load of relatively fast powder (IMR4895 is great) from the standard .257 Roberts data. Remington introduced the commercial version of this popular wildcat as a low-pressure round. ©2020 Outdoor Sportsman Group. The other prominent version is the .257 RCBS Improved, which features a 28° shoulder. Nosler, The World's Finest Bullets, Ammunition, Rifles, & Brass. Remington paid homage to the inventor by naming the new factory round the .257 Remington Roberts. P.O. Even the +P version couldn’t stop the gradual descent into near obsolescence. 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. I followed Nosler’s instructions shown in its No. Ackley, the modified 257 Roberts was likely the best improved round compared with the couple dozen or so factory cartridges he’d experimented with Ackley’s signature case modifications included reducing the body taper and increasing the shoulder angle—both significantly! Ned H. Roberts was one of several handloaders who experimented with wildcat cartridges in the 1920s and ’30s. If you are not certain about the chamber design in your rifle, we suggest consulting your gunsmith. Subscriber Services. [6] Neither unmodified .257 Roberts ammunition nor the original 6.5×50mm Arisaka ammunition are suitable for firing in rechambered Arisaka rifles.[7]. Ned Roberts is usually credited with being the designer for this cartridge idea. According to P.O. 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. All Rights Reserved. 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. That’s still less than the typical 60,000 to 65,000 psi of comparable modern rifle cartridges. After fire-forming, follow load data for the .257 Roberts Ackley Improved. With heavier bullets it is capable of taking all but the largest North American game animals. Rock River Arms LAR-15M .450 Bushmaster - Reviewed & Tested, Winchester .350 Legend Rifles and Ammo Available Right Now, Precision Reloading Guide Part 1: The Accurate Rifle, The Future Of Special Operations Small Arms. While thinning out my firearms inventory, I realized I could convert my Ruger Hawkeye bolt-action rifle chambered for .257 Roberts to .257 AI. [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. 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]. James Tarr runs through the 3-Second Headshot drill. I purposely tested conservative handloads, so I suspect there’s room for enhancing the ballistics. The .25-06 which holds another 8 or 9 grains of powder outperforms the .257 Ackley by about 200fps. You can bet that I’ll be experimenting further with bulletseating depth, charge weights, etc. The neck of the Roberts case would be slightly enlarged to accept handloaded 6.5 mm bullets. Tom Beckstrand and Neal Emery of Hornady highlight the 6MM Creedmoor ammo. 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. 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. *To fire-form brass, use the faster-burning powders and loads from standard .257 Roberts data. 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. 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). The two most popular "Improved" .257 Roberts cartridges are the Ackley and RCBS versions. *To properly chamber a rifle for .257 Ackley Improved cartridges, a gunsmith must set the original barrel back about 0.004”. Seat the bullet well out into the rifling, so that it makes good contact with the lands when the cartridge is chambered. This means you have the option to read your magazine on most popular phones and tablets. The .257 Roberts, also known as .257 Bob,[2] is a medium-powered .25 caliber cartridge. 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. 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. 257 Roberts Ackley Improved Rifle Cartridge. 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. I was pleased with the ballistics, and I lost only one case. 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). With a modern action and handloading, this cartridge is capable of markedly improved performance. Early articles by Townsend Whelen and Jack O’Connor proclaimed the virtues of the .257 Roberts in the hunting fields. .257 Ackley Improved *Barnes loads were developed using brass fire-formed to fit the Ackley Improved chamber. The modified Roberts cases are sometimes known as 6.5×.257 Roberts, although the case headstamp may still indicate .257 Roberts. Chambered for 257 Roberts Ackley Improved is Not offered at this time. According to P.O. 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. Plus, the primer pockets are still tight after at least three firings. The current SAAMI spec for the .257 Roberts Maximum Average Pressure (MAP) is 54,000 psi. I want to make readers aware of one special step that’s required when handloading the .257 AI. It also means you can easily fireform .257 Roberts factory brass or loaded rounds to achieve the .257 AI case shape, so you don’t need expensive forming dies or go through extensive case-forming steps.
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