There are three factors which affect the wounding and incapacitation performance of a projectile; 1) depth of penetration 2) expansion 3) retained volume / weight. Of course shot placement is the most important thing the shooter can supply but the projectile itself can only supply these three things. I just perused my copy of the 2009 FBI ammunition testing. I compared all of the similar 38 sp. rounds that were offered in both +p and standard pressures, there was even a +p+ round in there. The high pressure rounds didn't offer any consistent advantage over the standard pressure rounds, in fact they were outperformed just about as often as not. What is the advantage to the +p round? I know there's a velocity window every caliber has in which the three standards of performance are at their best. The increased pressure doesn't increase that window as far as I can tell.


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