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Old December 13, 2012, 12:10 AM   #10
Senior Member
Join Date: September 6, 2012
Location: Lakewood, CO
Posts: 893
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.
NRA Lifetime Member Since 1999

"I ask, sir, what is the militia? It is the whole people except for a few public officials." George Mason
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