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Nobody, including Browning, has proved bullets leave at the top or bottom of the muzzle axis swing with the Boss set for best accuracy. One can adjust charge weight 1/10th grain and do the same thing as a quarter turn of the BOSS ring. And no powder charge makes pressure curves exact enough to make all bullets leave at the exact moment the muzzle axis is stationary
It has been proved that best accuracy is when bullets exit just before the muzzle axis reaches its highest angle which more easily and better corrects for velocity spreads.
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