The Accurate Reloading Forums THE ACCURATE RELOADING.COM FORUMS Rifles Small Calibers 257 Roberts +P casesGo | New | Find | Notify | Tools | Reply | |
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| One of Us |
Any reason not to use Winchester +P cases in the 257 Roberts? I've always used Remington cases in my Model 70 Featherweight XTR and Ruger MKII Ultralight just because that's what I started with. Would I be able to get more velocity or is it not worth the change? Thanks. "Don't interfere with anything in the Constitution. That must be maintained, for it is the only safeguard of our liberties." Abraham Lincoln | ||
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I use them all and I have noticed no change in the load at all. | |||
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None I can think of. The latest Sierra and Nosler manuals do not distinguish between standard and Plus P loadings. The latest Hornady manual indicates its loads are for +P pressures in +P cases. My $.02. I didn't acquire the three roberts that I have in order to hot rod them. If you want fast, do a 257 weatherby. You can gain 600 to 900 fps, which is much more signicant than say 100 fps. GWB | |||
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Take your current loads back off to starter charges and work 'em back up. You should be able to get more velocity without pressure signs if you want to go faster. Then again if your main concern is accuracy, the loads in the +P brass stand a pretty good chance of working as well as the old loads in the Rem. cases. ******************************************************* For every action, there is an equal and opposite malfunction. | |||
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the reason that the loads are the same is because the [win] +p cases have less capacity and make the load +p. if you add 1 or so more grains to your regular brass you'll do the same thing. the 257 is held to lower pressures like the 7x57 round is. | |||
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Guys, I'm pretty sure (based on weighing several of each type of case) that it is the LOAD that is +P, not necessarily the case. I just sent an email to Federal, maybe they will settle it. I can discern no difference-other than the headstamp. It's the little things that matter. | |||
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In the 2 rifles you mention, I would not worry in the least. rember the Roberts load data is kept low for pre 98 mausers. Your rifles should handle any listed load with room to spare...tj3006 freedom1st | |||
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Might be moot after today. Finally got a good group out of 115 Ballistic Tips with 42 grains of H4350- 3/4". Chrono'd around 2700 and Hodgdon says up to 43.5, so I can try and work up a little. Also got Nosler 120 Partitions to 3/8" but only at 2500 fps with book max of 40 grains IMR 4350. Weirdest thing is Federal factory Nosler Partition 120+P has a different ogive than the old box (about 10 years old) of Nosler bullets I had on the shelf. I was trying to duplicate the Federal factories which shoot sub moa and chrono 2750. The Federal Partition is seated 2.360 off ogive and 2.775" coal but when I seat the Nosler reloads at that same ogive depth, the coal is 2.850" and won't fit in my magazine. Does Federal get a different Partition than reloaders or have they changed the ogive? Probably won't chase the 120 load because it's too slow. "Don't interfere with anything in the Constitution. That must be maintained, for it is the only safeguard of our liberties." Abraham Lincoln | |||
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Okay, Here's my question to Federal: "Re: the Federal loads for the 257 Roberts. When the load is +P spec, Is it the loading PRESSURE THE CASE,OR A COMBINATION? I am trying to find out is there an actual difference in the case (other than the headstamp) between the +P and the non +P cases. Thanks for your time, " and here is their answer: "Greetings, In the 257 +P it is only the powder that increases the pressure as the case is the same in non +P loads. The psi on the +P is 58,000psi. Thank you It's the little things that matter. | |||
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The only difference I can ascertain with +P and non +P in Winchester brass is that the web is thicker in +P brass, the case walls are almost identical. I sectioned Win, Rem and Fed brass, all seem very similar to me. I have been running my loads at 58,000-60,000psi for some time in 257AI brass with no ill effects, case life is normal, and I cannot see why it was downloaded in the first place? The 6mm Rem was never downloaded and it's practically identical! | |||
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The difference between "+P" Roberts brass and "regular" Roberts brass is the headstamp. That's all. Glad that the email from Federal cleared it up. Brass made by a given manufacturer on the .470-inch head (first used by the 8x57 and common to the .30-06, .270, .308 and a plethora of other calibers) ALL has the same head dimensions and thickness. There is no reason to vary it. The low pressure SAAMI standard for the .257 Roberts is one of the all-time mysteries of American ammunition practices. So far as I can ascertain, there was never a gun chambered for the Roberts that was not also (at one time or another) chambered for cartridges with higher SAMMI pressure standards. Why Remington decided to download it remains a mystery. Perhaps it was due to their misgivings about their 760 pump, but that gun was also chambered in calibers like .270 with a much higher pressure standard on the identical case head. Go figure. | |||
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GOOD POST....I believe this is totally accurate.....the "+P" stamp signifies higher pressure and not brass quality or dimensions! /////////////////////////////////////////////////////////////////////////// "Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy, its inherent virtue is the equal sharing of misery." Winston Churchill | |||
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When the Winchester +p cases appeared we quickly discovered the new cases were heavier that the old WW Super X. Roberts introduced the 25 Roberts in 1929 (if I recall correctly) in a two part article in the American Rifleman. Remington chronographed loads. Those loads were generally not mild. Roberts' rifle appeared to have a commercial Mauser action. The others involved used Springfield actions. My personal take on the 'Bob' is to work up loads as with any other cartridge. The old story was that Remington could not get accuracy with available bullets at the higher pressure levels. | |||
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