the Bob- now I'm just confused

This is a discussion on the Bob- now I'm just confused within the Cartridges & Calibers forums, part of the Sniping Related category; I know the .257 Roberts is a necked-down 7x57 mauser. But I just found 3 boxes reloaded by my Grandfather in the 40's, most of ...

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  1. #1
    Senior Member taylorism's Avatar
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    the Bob- now I'm just confused

    I know the .257 Roberts is a necked-down 7x57 mauser.

    But I just found 3 boxes reloaded by my Grandfather in the 40's, most of headstamped .30-'06

    Didn't realize you could do that.

    holding one of the '06-stamped .257 cartridges up against a real '06, I see you'd have to trim the case wayyyy down and completely re-shape the whole thing, lot of work and maybe hard to do well. That must weaken the brass. I think I see why .257 Roberts is sorta famous for being under-loaded.
    "If you hold a cat by the tail, you learn things you couldn't learn otherwise" -Mark Twain

  2. #2
    Senior Member jeffdorr's Avatar
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    The .257 was a popular wildcat that turned commercial. The .30-06 was probably used for reasons of availability. 7mm Mauser was a European/South American military cartridge at the time, so the brass may not have been readily available to the loader of the time.

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  3. #3
    Senior Member mavrick10_2000's Avatar
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    Re: the Bob- now I'm just confused

    Quote Originally Posted by taylorism
    I know the .257 Roberts is a necked-down 7x57 mauser.

    But I just found 3 boxes reloaded by my Grandfather in the 40's, most of headstamped .30-'06

    Didn't realize you could do that.

    holding one of the '06-stamped .257 cartridges up against a real '06, I see you'd have to trim the case wayyyy down and completely re-shape the whole thing, lot of work and maybe hard to do well. That must weaken the brass. I think I see why .257 Roberts is sorta famous for being under-loaded.
    The lower pressure loads were primarily due to the lower pressure proofed Pre K-98 mauser actions being used at the time.
    Pigs get Fed. Hogs get Slaughtered.

  4. #4
    Senior Member taylorism's Avatar
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    I see. Interesting. All my .257 brass is this old stuff, I suppose its all been fired at least once since being reformed. I have a lot of once-fired '06, I'll probably make some of it into .257 just to have done it, but I'm guessing I'll get better results from 7x57 cases.
    "If you hold a cat by the tail, you learn things you couldn't learn otherwise" -Mark Twain

  5. #5
    Senior Member BK13's Avatar
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    Re: the Bob- now I'm just confused

    Quote Originally Posted by taylorism
    But I just found 3 boxes reloaded by my Grandfather in the 40's, most of headstamped .30-'06
    That's funny. I have a whole pile of 7x57 brass from the same source.

  6. #6
    Senior Member taylorism's Avatar
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    Realllllly! OK Maybe I can talk you into bringing some of that with you when you come down!
    "If you hold a cat by the tail, you learn things you couldn't learn otherwise" -Mark Twain

  7. #7
    Senior Member mavrick10_2000's Avatar
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    Are you shooting those loads in a modern/current commercial action? If so get some Win +p .257 Robts Brass when it's in stock :wink:
    Pigs get Fed. Hogs get Slaughtered.

  8. #8
    Senior Member taylorism's Avatar
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    No it's a 1938 vz.33 sportered in the 40's. But I've come to find out most of the rounds I shot through it as a kid were loaded to over 3000fps and there's never been a hint of trouble. Solid Czech-made action made before they were fully NAZI-occupied, I'll take a vz.33 over a g33/40 any day.
    "If you hold a cat by the tail, you learn things you couldn't learn otherwise" -Mark Twain

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