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Old January 6, 2013, 11:01 AM   #3
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Join Date: June 9, 2010
Location: NEPA
Posts: 874
As Roy indicated you need a few fired cases from you rifle. Use the same brand of brass. You measure the OD of the case necks and subtract 0.003 inches. That gives you a starting point. You then have to change the bushing diameter to get the correct neck tension. Because each case maker uses a different thickness brass you will need a different bushing for each brand of brass (case).
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