Thread: Bullet Runout
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Old December 20, 2009, 09:28 PM   #2
Join Date: March 4, 2005
Location: Ohio
Posts: 17,956
The NRA book Handloading, had an A. A. Abbatiello (sp?) article showing that each thousandth of total indicated runout (TIR) would cause about a half of an moa increase in group size for M72 match ammunition, which was .30-06 with a 173 grain FMJ boattail. The tilt of the bullet in the cartridge remained when it entered the bore. This was true up to about 4 thousandths TIR, beyond which the bullet seemed to straighten itself out from any addition runout by its fit in the bore.

The sliding sleve Forster and Redding Competition seaters both do a good job of reducing the problem.
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