Bart B., the guy I know who goes above max charge is using a GAP Templar based rifle with a "cheater chamber" that seems to have been headspaced on a "Field" guage. He only gets about 4 shots before his brass is done, but after the first firing he'll neck size. I've seen his F/TR scores so I am convinced he is doing something right, at least as far as accuracy is concerned.
Jimro
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Machine guns are awesome until you have to carry one.
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