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Think of ballistics and sectional density. The bullet with more mass for its frontal area will take more powder to get to the same velocity but will also maintain that velocity for a longer period of time in flight. The heavier bullet will retain more inertial mass.Think of a cotton ball and a chunk of lead and their differences in fall rates.
Gravity without atmosphere they fall at the same rate of acceleration, but add an atmosphere and you now have to plough through it and the more mass behind the same frontal area the better it will be, because it contains more energy to begin with.
Best bullet design, boat tailed spitzer.
regards
Mech
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