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Old February 19, 2013, 02:00 AM   #7
AR15barrels
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Join Date: August 23, 2006
Location: Los Angeles, CA
Posts: 53
300 win mag headspacing

Quote:
Originally Posted by gmckinney626 View Post
So Gary, just face the barrel shank to achieve, I speculate, somewhere between .220 and .227 in the seat/ rim ledge?
That works great IF you know where your boltface datum is and you have a way to take accurate measurements on the barrel.
I made myself several specialized protrusion gauges that will reach around the barrel threads and touch the barrels shoulder and then measure how far a headspace gauge is protruding from the barrel shoulder.
There are commercially made tools like this now, but I made mine many many years ago before they were available off the shelf.
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