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Hopefully someone will chime in if I'm wrong, but I think that if you have two identical bullets that leave the muzzle of the same gun at identical speeds, their external ballistics should be the same.
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Not so sure about that, at least not with respect to point of impact. Muzzle flip is probably more a matter or INTERNAL ballistics, but it still affects POI.
So, if a fast powder and a slow powder produce the same muzzle velocity but a different acceleration curve, it MAY affect how the muzzle flips and returns to the sight line in the shooter's grip as he shoots a "double tap."
Others with more experience in shooting double-taps may be able to verify or discredit that line of thinking.
SL1