Early articles by Townsend Whelen and Jack O’Connor proclaimed the virtues of the .257 Roberts in the hunting fields. Remington paid homage to the inventor by naming the new factory round the .257 Remington Roberts. .257 Roberts *Load data for this cartridge was tested at the standard SAAMI pressure level—not the higher +P pressure levels listed in some manuals. Plus, the primer pockets are still tight after at least three firings. I have form/trim dies. Minimum Maximum Minimum AA 2700 42.5 46.5 IMR 4350 43.0 2984 47.0 3267 100 H4350 41.0 2953 45.0 3198 92 Hunter 44.5 3080 48.5 3314 94 RL 19 45.0 3008 49.0 3275 101 VIT N560 45.5 2953 50.0 3278 100 Bullet Weight: 100 gr Case Trim Length: 2.223" … Ackley has a couple listed in his book published in 1962. Dies - CH Armory - .257 Wby. All cases are Remington and … 22 PPC-USA. 6.5mm Caliber – 1:8 or 1:9 twist 6.5mm TCU. The .25-06 which holds another 8 or 9 grains of powder outperforms the .257 Ackley by about 200fps. $550.00. They are quite similar except for the shoulder angle, which is 40 degrees for the Ackley version and 28 degrees for the RCBS version. .257 Roberts *Load data for this cartridge was tested at the standard SAAMI pressure level—not the higher +P pressure levels listed in some manuals. 223 Rem. Posez votre Question. I have been leaning toward the .270 Winchester because there are more bullet weights available for it. That has me thinking about the other rifles in my safe, especially a Kimber 84 in .257 Roberts. Apr 1, 2020 #13 44hunter45 Well-known member. 257 P. The rifle has a 24 inch gloss blue barrel that is as new looking. .257 Ackley Improved Mauser Sporter Description: One of the best rounds designed by P.O. 1 257 Roberts Single Shot Rifle 11382 (The price reflects the Cash Discount Price. Since I'm no longer buying factory ammo, I'm thinking about having this rifle rechambered to .257 Roberts Ackley Improved, and I am wondering if folks have advice on how I … The .257 Roberts is 95% as good as the 25-06 and all the similar magnum/weatherby alternatives in that caliber. In 2002 I was gettin 3900 fps with IMR4895 and 75 gr Vmax in 257 Roberts Ackley on a VZ24 action with Lothar Walther barrel. They are quite similar except for the shoulder angle, which is 40 degrees for the Ackley version and 28 degrees for the RCBS version. Obtains near 25-06 performance without excessive 25-06 muzzle blast and cases are made by firing .257 factory ammunition in the improved chamber. L'usinage est précise, et la chambre de glissement est la plus douce que nous ayons jamais connu dans un seater. "Match" 257 Roberts Improved. Anyone have experience fireforming brass for the Ackley 257 Roberts Improved cases. I form 257 Roberts from 30/06 cases. The next area of concern was with the pressure ring. Joined Jul 1, 2007 Messages 366 Location Idaho. Redding Type S Match Bushing 3-Die Neck Sizer Set 257 Roberts. Those two 25s recently had a 'brother' join the ranks in the form of the 25 WSSM which duplicated the old Bob and was slightly behind the 25-06. Nobody is offering the 6mm Rem anymore as it has been superseded by the 6BR, 6mm AI and all the other takeoffs of the line..257 Roberts and the 6MM are niche calibers and getting rare. Illustration courtesy of Hornady Mfg. 22-250 Rem Ack Imp. *The.257 Ackley Improved is a wildcat cartridge, so there is no SAAMI spec for maximum overall cartridge length (COAL). I got a 257 Roberts Ackley Improved reamer and 4 CM Lothar Walther light varmint barrels from Brownells in 2002. This means you have the option to read your magazine on most popular phones and tablets. 5.56x45 NATO. Ned H. Roberts was one of several handloaders who experimented with wildcat cartridges in the 1920s and ’30s. I soon discovered that a number of 6.5mm Jap rifles had been rechambered in .257 Roberts. 6.5mm50 cases may not have been expensive but they were not easy to find. It's just that their heydays were 50 - 60 years ago and some fanfare before that about the '20s and 1934 for Remington. 107 SW Columbia St | Bend, Oregon, USA 97702 | Toll Free: 1-800-285-3701 | email@example.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. Springfield Armory M1A Tanker .308 Review, Winchester .350 Legend Rifles and Ammo Available Right Now, Revolver vs. Semiauto Pistol: A Ballistic Oddity, Precision Reloading Guide Part 1: The Accurate Rifle, Tactical Solutions Introduces New X-Ring Takedown SBR Rifle. For examples of what is required, look at the 223 Remington page. Rifle is an FN supreme with 24” … View Profile View Forum Posts Private Message Title Premium Member Join Date Jul 2018 Location North Texas Posts 1,656. Chambered for 257 Roberts Ackley Improved is Not offered at this time. The following data was developed in a rifle based on a HALL action. Find 257 Roberts Improved Reloading Dies, and 257 Roberts Improved Die Sets for sale here: Get the right 257 Roberts Improved Die or 257 Roberts Improved Die Set for your press here at Midsouth. The 257 Roberts is one of two .25 caliber cartridges used for daily production testing in the Nosler Ballistics Lab. 257 roberts ackley improved mauser 98. very nice stock&blueing, good barrel. This allows standard.257 Roberts ammunition to be safely fired in.257 Roberts Improved chambers. 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. Bulk Ammunition on sale, including 257 Roberts Rifle Rounds. Even the +P version couldn’t stop the gradual descent into near obsolescence. 25 - 06 Improved. Seller: ray sophy ray sophy. Tom Beckstrand and Neal Emery of Hornady highlight the 6MM Creedmoor ammo. $303.00 $ 303. It originally had a 243 barrel that was thoroughly shot out. I built up 4 rifles on 98 Mauser actions, one for myself, and 3 for the guys I hunt with. IMR 4350 is an excellent powder for our hunting weight bullets. My Account My Orders My Address Book My Password. They were the most accurate rifles we had ever owned. 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. 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