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Old December 20, 2009, 08:42 PM   #1
roc1
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Join Date: July 31, 2005
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Bullet Runout

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How important is bullet runout. I have never worried about in all my years of loading and I have heard if you keep it to .002 or under it will make a huge difference. I was wondering if this is true on lots of reloads all different brass and using a powder measure? which tool works best for checking runout and how do you fix the problem on loaded rounds? I guess turning the necks is the best solution for solving this problem correct? my loads have always done the trick but again I am not a benchrest shooter. I am interested to know how much this would help on overall group size?
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Old December 20, 2009, 09:28 PM   #2
Unclenick
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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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