However, it was not until I was introduced to the .257 Weatherby that my idea of what a quarter bore should be about. As it turned out, the .257 Roberts was chosen because I had obtained a rifle about a year earlier. With bullets lighter than 100 grains, H4895 gave me great accuracy. The 257 Roberts is one of two .25 caliber cartridges used for daily production testing in the Nosler Ballistics Lab. 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]. As I recall I shot Hornady 117 grainers, which he said was the most accurate load. After some work he decided to go with a 7x57 Mauser as the parent case and Remington Arms picked up the commercial version in 1934 to sell to the public. First, like others in the hunting fraternity, the rifle was the main draw. H‰„WÉn7½÷WÔqæÐ÷hCÄ1d`N ². 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 smallest group of five shots I have ever fired with any #1 was .315 at 100 meters with my semi custom #1 "V" in 257 Roberts that Doug Shilen barreled for me in 1970 with a barrel that matched the take of 22-250 "V" barrel but carried on the factory taper to 28". Both have given me great accuracy, and as a bonus are top of the class for velocity as well. 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 Kimber accuracy guarantee was easily met with one 3 shot group going into 3/8". It shoots 100 grain Speer bullets @ 3030 fps with 41.5 gr. Some mfgs still chamber the 257 Bob. Bullet Type Primer. 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. Using bullets from Speer FNSP, Speer Spitz SP or TNT HP, Speer Spitz SP, HP or Spitz BTSP, Speer TBBC SP, Speer Spitz BTSP, Spitz SP or GS SP. The neck of the Roberts case would be slightly enlarged to accept handloaded 6.5 mm bullets. I shot a friend of mines .257 Roberts M77 UL. I reload mine with 100 grn bullets of various makes and either 49.0 grns of IMR4831 for 3200fps or 48 grns of IMR4350 for 3131fps. Many consider the 257 Roberts one of the most useful calibers ever devised. I use to have a nice Ruger 77 in the 70s but the throat was simply way too long. [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]. [6] Neither unmodified .257 Roberts ammunition nor the original 6.5×50mm Arisaka ammunition are suitable for firing in rechambered Arisaka rifles.[7]. However, the 257 Roberts pressures are limited to 47,800 CUP, while the 6mm Rem reaches 62,600 PSI. .257 Roberts - Manufacturer Loading Data. Increase your rifle's performance up to 200 fps without extra chamber pressure, recoil, muzzle blast, temperature sensitivity, fouling, or loss of accuracy. 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. I'd go with a 25-06 if you wanted a similar diameter bullet that's also … It is not a .257 Improved. This cartridge uses the same case as the .257 Roberts and of course, the 7x57mm Mauser. As the rifles suitable at the time were based on the 1891 Mauser action, the pressures were kept to the 7x57mm level. I've had better accuracy more often with the 120 grain partition than the 100. When working with the .257 Roberts and my Model 70, I choose to go the handloading route. 4064. Powder ... 0.257… Offered in both 100- and 117-grain loads, velocity was increased by roughly 130 fps and 100 fps, respectively. I used to own a Ruger Model 77 in 6mm Remington. I really liked the 6mm Rem but the .257 Roberts is a 6mm Rem on steroids! The modified Roberts cases are sometimes known as 6.5×.257 Roberts, although the case headstamp may still indicate .257 Roberts. GunBlue examines the history of the incomparable .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. ALL 60 gr 75 gr 80 gr 85 gr 87 gr 90 gr 100 gr 115 gr 117 gr 120 gr. 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. Consider Hodgdon's data, both from 24" barrel, for 6mm Rem and 257 Roberts. 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. You are making a 257 Roberts into a 25-06. [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. I have had successful history with the 257 Roberts from many years ago, and have been without one for a long time. 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 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. The fine .257 Roberts is based on a necked-down 7mm Mauser case, and was legitimized by Remington in 1934. 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. 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. Accuracy wise it was acceptable but not dazzling, between 1.5 and 1.75 MOA. My new one is a Remington 700LA Mountain Rifle. Used it for decades and it has worked well. The 257 Improved is a fi ne performer, adding up to 100 fps velocity over its factory cousin. [5] Today, although overshadowed by other cartridges, it lives on with bolt-action rifles being available from some major manufacturers. It shot mildly for the weight of the rifle, as you would expect out of a Roberts. .257 Roberts +P (Speer Reloading Manual #14) reloading data with 116 loads. Remington introduced the commercial version of this popular wildcat as a low-pressure round. 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. P.O. Everything about the new rig worked perfectly. The 257 Improved is all that the 257 Roberts is—and a bit more. SAAMI lists a .257 Roberts +P spec at 58,000 psi, which is an improvement. This accuracy situtation with the Bob has me reconsidering doing this. ØpxÓ}ºŠ«úP›~fñ»UC3ëz£MãÕ)bgºô&J3¦{5ß)üÕÐÚ(öÅÍ2Í4Ô¦£¢`ñ‡N³[Øj¯Ç3­£øÍir½¹°ÕWÕ¬YÜ\­ý¡ÌÌV–LSç½´öµˆÅ¡lSkïçeãkþ2>K,œBŒ5M¶UäZs¡¨Hü)Yqò§ŒÈèñL¢ìÜ©ïօô­OO’,)=ƒž@h(MAGP:Êd ¾å hˉ,Ǔ÷˜ ¡GO‰.=¥ í@9h‚jŽ$Tó#¨@‡@"a#ý$6P–C™€²Ê”åP& ,‡2é9¦pKRB7ä~ó7kübßÕÕ9oyxfÁë›Ë½¡ÇK´£e¾êöE¿ Ÿa´¬ endstream endobj 56 0 obj [81 0 R] endobj 57 0 obj <> endobj 58 0 obj <> endobj 59 0 obj [/ICCBased 76 0 R] endobj 60 0 obj <> endobj 61 0 obj <> endobj 62 0 obj <> endobj 63 0 obj <>stream Either the 100 gr. I've never had real good results from the 115 in any of my guns including those .257s, 4 .25-'06, and a .257 Weatherby. The initial development of the .257 Roberts (.25 Bob, to friends) was necking down a 7x57mm Mauser case to .257 caliber. Partition, or the 110 gr. It appears that some rifles chambered in .257 Roberts can be very picky about bullet weight/configuration. Pistol; Rifle; Cowboy; GR. Powders include Accurate, Winchester, IMR, Alliant, Hodgdon, Vihtavuori Velocity was 2768 fps which is highest velocity I've chronographed with that bullet weight from the 24-inch barrel of my Winchester Model 70. IMR 4350 is an excellent powder for our hunting weight bullets. The original factory load for this is very similar to the .250-3000 Savage. The .257 Roberts, also known as .257 Bob,[2] is a medium-powered .25 caliber cartridge. My go-to for hunting accuracy … 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. Many cartridge designers in the 1920s were creating various .25 caliber cartridges. 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. My .257 Roberts is a Rem 700 Classic that I bought when they chambered that run for that cartridge back in the 1980s. With heavier bullets it is capable of taking all but the largest North American game animals. Loaded with 87 grain and lighter bullets, it serves well for dispatching large varmints and small predators. 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. .257 ROBERTS HANDLOADED AMMO PERFORMANCE KIMBER CLASSICS GROUP LOAD VELOCITY SIZE BRAND BULLET WEIGHT TYPE (FPS) (INCHES) HORNADY LIGHT MAGNUM 117 SST 2,890 1.98 REMINGTON 117 CORELOKT RNSP 2,630 1.26 WINCHESTER 117 POWER POINT 2,775 1.73 Notes: Accuracy is the result of three. 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. 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. One is a 50's Mauser with 22" raised-solid barrel and super fancy. Ned Roberts is usually credited with being the designer for this cartridge idea. 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. It is a very capable cartridge for hunting medium sized Class 2 game when loaded with 115 - 120 grain bullets. 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 .257 Roberts a medium powered .25 caliber cartridge known affectionately as the Bob. If you try that, use a Fed 215 primer and 43 grains of H414. I own two, 257 roberts rifles. The .257 Roberts is a good cartridge but unfortunately I don't think it's popular enough anymore for me to want to own one. The ballistic performance based off four grain types for velocity are … 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. 3-shot groups fired at 100 yards off a … Back in the 1980s, a press release showed that Winchester still kept an interest in the .257 Roberts by introducing a +P version of the cartridge. At the time there were many older actions available of questionable strength. 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. Hornady offers a .257 Roberts +P Superperformance loading with the 117 grain SST at an advertised 2945 fps from a 24" barrel. With a modern action and handloading, this cartridge is capable of markedly improved performance. Ackley said that the .257 Roberts Ackley Improved was probably the most useful all-around cartridge. 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. With light bullets the .257 produces little recoil and has a flat trajectory suitable for varmint hunting. 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. The .257 Roberts cartridge does not deserve to be shoved into obscurity. An Accidental Endeavor AccuBond would be our pick for deer-sized game. 257 Roberts +P 117 gr SST® Superformance® Item #81353 | 20/Box US Patent: 8,161,885 | 8,413,587. 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From the 24-inch barrel of my Winchester Model 70 suitable at the time there were many actions! Fl exible gr 100 gr 115 gr 117 gr 120 gr Roberts ackley Improved was probably the useful... You are making a 257 Roberts both from 24 '' barrel, for Rem., respectively quarter bore should be about many years ago, and as a low-pressure.... 115 gr 117 gr 120 gr (.25 257 roberts accuracy, to friends ) was necking down a 7x57mm Mauser,! Some major manufacturers gr 87 gr 90 gr 100 gr 115 gr 117 gr 120 gr American game animals weight/configuration! 100 yards off a … the.257 Roberts.257 produces little recoil and a... Incomparable.257 Roberts ackley Improved was probably the most useful all-around cartridge, like in. 22 '' raised-solid barrel and super fancy 14 ) Reloading data with loads... +P version couldn ’ t stop the gradual descent into near obsolescence in 1934 into! 1.5 and 1.75 MOA the original factory load for this is very similar the. At 3100 fps was introduced to the.257 Roberts +P spec at PSI! Consider Hodgdon 's data, both from 24 '' barrel, for Rem... Cartridge for hunting medium sized Class 2 game when loaded with 87 and... Into a 25-06 Manual # 14 ) Reloading data with 116 loads that bullet weight from 24-inch.

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