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Originally Posted by antikristuseke
The speed at which a projectile spins does affect the projectiles likelyhood to tumble on contact and due to that allso the likelyhood of the bullet to fragment since the round fragments when going through mater sideways where the force is too great for it to retain structural integrity.
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According to the US military, it has no effect. Dr. Fackler reports that the bullet will seek a state of center of gravity forward, regardless of twist rate. This is the rear end of the bullet. Penetration between the two are shown as nearly identical. If you notice, the heavier 62 gr starts this transition earlier than the 55 gr, even though it is spinning faster:
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From my own experience i have found 115grain 9mm rounds to penetrate a bit better than 230grain .45 fmj. Cant really say anything on the .357 since i havent got any experience with it and it being 4am dont really feel like going through hours worth of material to come to any conlusion.
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115 gr by the way is the worst ammo weight of any 9mm round out there. Though fun for plinking - (put almost 700 rounds through MP5's and Glock 18's last time I was in AZ! The glock eats ammo faster though and is not very good for anything more than spraying!). So bad it is banned by the FBI for use in the line of duty. It has a pathetic penetration of only about 8 to 10 inches (An expanding round is even worse. The FBI require minimum 12 inches since you will never get a full on torso shot when defending yourself). This is why that guy who was shot 32 times with 115 gr, with about 10 of them that should have been fatal, failed to be dropped! He returned fire like nothing was wrong! the 33rd time he was hit, hit his juggler vein (A major lucky shot!) and that is the only thing that dropped him. 147 gr 9mm fixes this issue by the way and has proper penetration. I wouldn't bet my life on 115 gr. I personally don't like the 9mm round at all. I'd pick a .40 as a compromise between 9 mm's lack of ability but large ammo capacity, and the .45's overall capability. In my mind though, I am in serious trouble if I need more than the 9 chambered round in my .45, so it is fine for my purposes, and highly likely to end a fight with only 1 hit.
-S