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1/7 or 1/9 rifling would cause the bullet to explode into powder due to centripetal forces at that speed. What a moron.

ETA:
I remember reading about a guy who over powered his reloads and had his bullets explode when exiting the barrel. I actually did the math and was shocked at the Gs the outer casing of a bullet faces. Can't find my research or the original article. I'm not doing it again tonight, but if somebody really wants me too, I could be talked into it. Or maybe somebody smarter than me on this board can do it.