http://gundata.org/blog/post/bullet-velocity-and-barrel-length/ WebJul 16, 2013 · In the 9MM, this chart shows that though a heavier round than a .22, with a larger propellant load and higher velocity, the optimum barrel length is still about 16" delivering 1600 FPS. With .45, its bigger, heavier round and relatively low velocity requires a bit longer of a barrel to reach optimal performance, with the best performance found ...

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