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Old December 13, 2012, 12:10 AM   #10
iraiam
Senior Member
 
Join Date: September 6, 2012
Location: Lakewood, CO
Posts: 799
I was taught to use a 4 jaw chuck and adjust to the bore of the rifle. I usually make a set of bushings that fit the bore and hold a ground rod that sticks out the bore, then dial indicate and adjust off of the rod.
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