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National Match question

Discussion in 'Gunsmithing and Repairs' started by 1 LT MPC, Sep 1, 2006.

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  1. 1 LT MPC

    1 LT MPC Member

    Jul 11, 2006
    Martin's fork of the Cumberland
    Anyone remember what recoil spring (and hammer spring) poundage is factory set for th NM. When my dad passed away, he left me his NM Gold Cup and two recoil springs (along with firing pin or hammer springs). I know he shot a lot of 185 gr semiwads and would change the springs for 230 ball. One spring is listed at 20 pounds but I think that is not the factory issue.
    The Colt is a .45 with the NM serial prefix.:confused:
  2. Canuck-IL

    Canuck-IL Member

    Feb 15, 2005
    14 and 18#s usually works - not sure if that was factory issue however.
  3. Jim Watson

    Jim Watson Member

    Dec 24, 2002
    Standard recoil spring for G.M. is 16-17 lb; "heavy duty" is 18. Obviously a 20 lb worked for your Dad, but some people say that too much recoil spring slamming the gun shut can be as bad as too light a spring letting it slam open.

    Target load springs are obviously lighter, I use a 12 lb spring in the gun I shoot with light load semiwadcutters; it was not 100% with a 14 lb.

    I read once that the Colt assembler just clipped a standard spring until the Gold Cup functioned with 185 gr mid-range semiwadcutters.
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