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Old May 11, 2005, 06:21 PM   #3
Senior Member
Join Date: December 3, 2002
Posts: 1,156
Fed GM is a duplicate of M852. The standard M852 duplicate is 41.5grs IMR 4895 in a surplus case. It may take a little more than 41.5grs to get 2600fps in a commercial case.

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