Eric, this will make sense if you consider that the more energy put into the bullet, the more "power." In a longer barrel, the bullet stays in the barrel longer, to be pushed/accelerated by the pressure of ignition that extra bit of time, which is why the exiting round is faster than one from a shorter barrel. Henrik's data tells the story!
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"... Liberty is the seed and soil, the air and light, the dew and rain of progress, love and joy."-- Robert Greene Ingersoll 1894
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