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GeauxTide · September 5, 2009, 03:34 PM

When the head measurement is .005 over SAAMI specs, that is maximum in that rifle. 308 head measures .473, so that would be .478. He also says to use good sense because of the many variables in the manufacture of rifle barrels. For example, my ER Shaw 6.5-06 will open primer pockets up before .478 is reached.

September 5, 2009, 03:34 PM	#7
GeauxTide Senior Member Join Date: April 20, 2009 Location: Helena, AL Posts: 4,514	Ken Waters Rule When the head measurement is .005 over SAAMI specs, that is maximum in that rifle. 308 head measures .473, so that would be .478. He also says to use good sense because of the many variables in the manufacture of rifle barrels. For example, my ER Shaw 6.5-06 will open primer pockets up before .478 is reached.