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Old February 18, 2013, 10:47 PM   #4
4V50 Gary
Join Date: November 2, 1998
Location: Colorado
Posts: 19,300
You're right that magnum cartridges are headspaced off the rim.

Headspace isn't adjusted by tightening down the barrel. It's done by either pushing a finishing chamber in deeper or if too deep, to shorten the barrel shank.
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