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Thread: Question about chamber inner diameter

  1. #1
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    Question about chamber inner diameter

    I was talking to my dad and I couldn't dind a max spec for the inner diameter of the chamber where the throat is in a .223.
    I looked all over and could only find the specs of the casing but I we were wondering what the clearance tolerance is. Thanks in advance.

    Sent from my SM-G960U using Tapatalk

  2. #2
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    Quote Originally Posted by futurerider103 View Post
    I was talking to my dad and I couldn't dind a max spec for the inner diameter of the chamber where the throat is in a .223.
    I looked all over and could only find the specs of the casing but I we were wondering what the clearance tolerance is. Thanks in advance.

    Sent from my SM-G960U using Tapatalk
    Did you look at the SAAMI specs?

    https://saami.wpengine.com/wp-conten...sting-Copy.pdf

  3. #3
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    Yes, SAAMI is the official source.

    The freebore diameter of the .223 Rem chamber shows .224+.002

    However, this is generally tightest chamber in the family, with others like 556 NATO allowing up to .227+.002

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