Anybody (else) remember the really old days, when they designed a cartridge to deliver a certain level of performance, and then built a gun to shoot it in??
Seems like every "new" round in the last few decades has been designed to fit in a specific gun, and deliver the same, or as close as they can to the performance of older rounds that won't fit in that specific gun.
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All else being equal (and it almost never is) bigger bullets tend to work better.
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