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  1. #11
    User
    Join Date
    Apr 2019
    Location
    Cape Town
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    1,784

    Default Re: Short barreled .22-250.

    So, what pressure do you need to get 3200 out of 14.5"?

  2. #12
    User
    Join Date
    Jul 2011
    Location
    BFN Freestate
    Age
    45
    Posts
    12,151

    Default Re: Short barreled .22-250.

    Quote Originally Posted by janfred View Post
    So, what pressure do you need to get 3200 out of 14.5"?
    75 000 PSI

  3. #13
    User
    Join Date
    Oct 2012
    Location
    Noord van die biltong gordyn.
    Age
    56
    Posts
    9,116

    Default Re: Short barreled .22-250.

    Quote Originally Posted by FNBROWNING View Post
    In a 14.5 inch 223 I get 3200 with 55 grain mill surp. Add a few inches and the 22-250 won't be doing much if any better. Seems like the 20 inch barrel drops it back into 223 territory.
    Local Berdan-primed milsurp usually does that from an 18" barrel.

  4. #14

    Default

    Quote Originally Posted by driepootx View Post
    That millsurp is cooking with gas. A speed of 3250fps with a 20 inch barrel is at 60K psi (max for 223).
    Enlightening; strangely this batch showed no unusual pressure signs that I could discern. I now have a lot more respect for AR durability

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