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Old December 30, 2012, 10:00 PM   #29
Senior Member
Join Date: October 18, 2006
Posts: 6,215
3/10ths of a grain has about the same effect on muzzle velocity at a 10 degree change in temperature (F not C).

If you do an OCW load workup, it will identify a load where +/- .3 grains is nothing.

Machine guns are awesome until you have to carry one.
Jimro is offline  
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