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The protectile and powder were the same in each test. Only the rifle and thus barrel length were different. Just an observation that the lighter 150's showed a more pronounced velocity gain in the...

I also have 7mmRM Sendero with a 26" barrel and a 7mmRM T3 with a 24 3/8" Barrel. With 162SST's, 168 VLD's, and 180 VLD's there is about a 2% increase in velocity for the same powder charge and...