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Old January 20, 2013, 09:58 AM   #11
kraigwy
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Join Date: June 16, 2008
Location: Wyoming
Posts: 9,411
Quote:
Does anyone use IMR 3031 for .223?
The Army does.

The Army used a Mann Accurach Device to test their ammo. The one for the 5.56 is a 1:7 twist barrel on a Remington Action. Super tight chamber, and 18 inches long.

To test the device they load 25 grns of 3031 in a Remington Case, match primers and 52 grn match bullets.

The grouping averages about .18
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