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Old May 16, 2011, 10:05 AM   #16
Unclenick
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Join Date: March 4, 2005
Location: Ohio
Posts: 21,022
If you're running .30-06 in the Garand, you may want to crimp Hornady 150 grain FMJ bullets and others that have a crimp cannelure. The bearing surface is short so the neck doesn't have as much grip against bumping up the feed ramp, and some amount of setback can occur. With longer match bullets from 168 grains and up, I've never seen a crimp required in that rifle.

In a bolt gun, in some instances (particular bullet/powder/primer combinations), the crimp improves start pressure enough to be beneficial to ignition consistency and accuracy. This is more likely to be observed with spherical propellants than stick powders.
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