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Thread: 223 to 257 bolt face

  1. #1

    223 to 257 bolt face

    does anyone here know if a microlength mauser action such as the old brno .223 or .222's that accept 9.6mm case bases can be reamed out to accept the 12mm case base on a .257R?

    also, would this be safe given the significant difference between a .257 and a .223!? I just feel I read somewhere that a .223 action could be reamed out to .257, but that may of course only have been a standard short or long action, not a microaction.

    any takers?

  2. #2
    not enough meat on my bolt to ream out that much I dont think

  3. #3
    Quote Originally Posted by bewsher500 View Post
    not enough meat on my bolt to ream out that much I dont think
    I think you boys are testing us, but I'll play along anyway.

    The CZ527 carbine has always been made in 7.62 Soviet (7.62x39) so the answer is YES.

    Do I get a prize?
    If I'm going to be accused of it then it's just as well I did it.

  4. #4
    .223 - 0.378"bolt face. 7.62x39 - 0.442"bolt face. .257 - 0.473" bolt face and long action (57mm case length)
    1. Answer not a fool according to his folly, lest thou also be like unto him. Proverbs 26:4 (King James version)
    2. Let not any one pacify his conscience by the delusion that he can do no harm if he takes no part, and forms no opinion. Bad men need nothing more to compass their ends, than that good men should look on and do nothing.

  5. #5
    If i am correct mauser bolts do not have a recessed bolt face so a change of case of diametre should only a matter of swapping to the appropriate claw extractor, dont quote me on this, maybe someone with a more comprehensive knowledge of mauser actions could explain.


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