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Originally Posted by kcub
This is not a fact nor do I believe it. Go shoot some cans or something and witness the kinetic difference in how far the cans jump for yourself. The 9mm is akin to .38 special and the .40 is akin to .357 magnum.
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.40 is my favorite round, I prefer it to any other for SD and HD, but all the research I've seen indicates that it does in fact have nearly identical penetration, expansion, and cavity results in bare or lightly clothed flesh as 9mm and .45. The service cartridges are all very similar. I think .40 is a bit better and it's just as easy for me to shoot, but the performance gap between it and 9 is nowhere near the gap between standard pressure .38 and .357 magnum. I think that overstates it. Similarly, I think the folks who say .40 has
no advantage over the 9mm are understating it. As with practically all debates, and especially caliber wars, the truth is somewhere between extremes.