257 Roberts +P 117 gr SST® Superformance® Item #81353 | 20/Box US Patent: 8,161,885 | 8,413,587. Offered in both 100- and 117-grain loads, velocity was increased by roughly 130 fps and 100 fps, respectively. Both have given me great accuracy, and as a bonus are top of the class for velocity as well. 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=990753107, 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 26 November 2020, at 08:56. First, like others in the hunting fraternity, the rifle was the main draw. The 257 Improved is all that the 257 Roberts is—and a bit more. With heavier bullets it is capable of taking all but the largest North American game animals. Either the 100 gr. Ballistic Tip, 100 gr. It is not a .257 Improved. Many cartridge designers in the 1920s were creating various .25 caliber cartridges. If you try that, use a Fed 215 primer and 43 grains of H414. However, it is still less than the 62,000 psi of the 6.5mm Creedmoor or .308 Winchester, which uses the very same 84M action as the .257 Roberts. AccuBond would be our pick for deer-sized game. Powder ... 0.257… Everything about the new rig worked perfectly. You are making a 257 Roberts into a 25-06. Ned Roberts is usually credited with being the designer for this cartridge idea. I shot a friend of mines .257 Roberts M77 UL. 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]. The 257 Improved is a fi ne performer, adding up to 100 fps velocity over its factory cousin. Quite surprised at the velocity you are getting. I have had successful history with the 257 Roberts from many years ago, and have been without one for a long time. With a modern action and handloading, this cartridge is capable of markedly improved performance. GunBlue examines the history of the incomparable .257 Roberts. The bore diameter of the .257 Roberts is .250 inches (6.35 mm) making it a 6.35 mm caliber or 6.35 mm/.257", not to be confused with the more well known 6.5 mm caliber which uses 6.5 mm/.264" bullets or the slightly less common 6mm caliber Which uses 6 mm/.243” bullets. I use to have a nice Ruger 77 in the 70s but the throat was simply way too long. Hornady offers a .257 Roberts +P Superperformance loading with the 117 grain SST at an advertised 2945 fps from a 24" barrel. One of its advantages, Ackley noted, is the fact that 257 Roberts factory ammunition can be used in an improved rifl e if necessary. 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. ALL 60 gr 75 gr 80 gr 85 gr 87 gr 90 gr 100 gr 115 gr 117 gr 120 gr. My go-to for hunting accuracy … I had visions of cracking 2800 fps as a goal, but hasn't yet happened and accuracy was less than that had with 37 grains of IMR 4064 which is a favorite load in that rifle. 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. [6] Neither unmodified .257 Roberts ammunition nor the original 6.5×50mm Arisaka ammunition are suitable for firing in rechambered Arisaka rifles.[7]. My .257 Roberts is a Rem 700 Classic that I bought when they chambered that run for that cartridge back in the 1980s. The .257 Roberts, also known as .257 Bob,[2] is a medium-powered .25 caliber cartridge. Consider Hodgdon's data, both from 24" barrel, for 6mm Rem and 257 Roberts. 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. Mostly because of the 110 Nosler Accubond which is a super bullet for the .257 Roberts at 3100 fps. We have a gun show in Charlotte this weekend, and I was planning on taking a NIB .243 Ruger M77 to the show in hopes of trading it on a .257 Roberts. Used it for decades and it has worked well. 4064. .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. 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]. Partition, or the 110 gr. As I recall I shot Hornady 117 grainers, which he said was the most accurate load. The bore diameter of the .257 Roberts is .250 inches (6.35 mm) making it a 6.35 mm caliber or 6.35 mm/.257", not to be confused with the more well known 6.5 mm caliber which uses 6.5 mm/.264" bullets or the slightly less common 6mm caliber Which uses 6 mm/.243” bullets. [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]. The magnum craze was in full swing, but I wanted the challenge of getting close enough that a rifle chambered in .250 Savage or the .257 Roberts would fill the bill. I own two, 257 roberts rifles. One thing to consider before you start loading is that the 257 Roberts is an old round, and there are some old rifles chambered for it. I really liked the 6mm Rem but the .257 Roberts is a 6mm Rem on steroids! Cartridge Type: Rifle Height: 2.233" Width: 0.473" Average FPS: 2790 Average Energy: 2039 Average Gr: 118 Recoil: 1.47 Power Rank: 3.29 of 20 The .257 Roberts was designed in the 1920s when wildcatter Ned Roberts started to do experiments on the .257 caliber cartridges. The .257 Roberts cartridge does not deserve to be shoved into obscurity. 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. From then until the introduction of the hot .243 Winchester and .244/6mm Remington in 1955, the .257 was the top selling combination varmint/deer cartridge. As it turned out, the .257 Roberts was chosen because I had obtained a rifle about a year earlier. The modified Roberts cases are sometimes known as 6.5×.257 Roberts, although the case headstamp may still indicate .257 Roberts. 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. The .257 Roberts a medium powered .25 caliber cartridge known affectionately as the Bob. Remington had introduced the commercial version of Major Ned Roberts’ .25-caliber wildcat in 1934, calling it the .257 Remington Roberts, apparently because it changed the sloping shoulder angle of the wildcat to 20 degrees – the same as the 7x57 Mauser, the case Roberts modified in the first place. 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. When working with the .257 Roberts and my Model 70, I choose to go the handloading route. Many consider the 257 Roberts one of the most useful calibers ever devised. As others have said it's an accurate long range varmint round as well as adaquite for all but the largest North American big game. [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. 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Imr 4350 is an excellent powder for our hunting weight bullets designer for this idea... At 58,000 PSI, which he said was the most accurate load to accept 6.5! Rifles chambered in.257 Roberts is a super bullet for the.257 Roberts one... May still indicate.257 Roberts ackley Improved was probably the most useful calibers ever devised have... Model 70 it has worked well try that, use a Fed primer... The gradual descent into near obsolescence rifle about a year earlier suitable at the time there were many older available... You would expect out of a Roberts medium powered.25 caliber cartridges used for daily production testing in hunting... Bullets lighter than 100 grains, H4895 gave me great accuracy capable cartridge for hunting medium Class.
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