30-06 M1 COL

Toolfogie

January 28, 2011 12:09

Various sources list the Cartridge Overall Length for 150 gr FMJBT 30-06 at anywhere from 3.220 - 3.280. The Greek Milsurp ammo I have for my Garand is 3.315 so that's what I've been reloading to. Just wondering why the large difference in COL and am I OK with copying the Milsurp ammo? I would certainly think so. Thanks.

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  bpost

  January 28, 2011 12:29

  A COL length is a guide to allow the proper function and feeding from the magazine of the gun being fired. Max OAL for M-2 ball is 3.340.
  
  Your OAL is fine as long as it feeds OK.
  
  Rounds not feeding from a magazine may exceed the recommended OAL by quite a bit when seeking ultimate accuracy.

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  jonk

  January 28, 2011 14:57

  It depends on bullet profile too. A blunt round nosed bullet will require a shorter overall length than a spitzer, to prevent binding against the rifling, particularly in a new gun with short throat.
  
  On the M1 if it feeds through the mag, it's probably going to chamber fine. Try gently closing the round on a dummy loaded without powder or primer if you are concerned. If it chambers, that OAL is good to go.

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  Toolfogie

  January 28, 2011 15:07

  Thanks guys, appreciate the info.

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