As much as the curmudgeons favor it, .45 Auto has a dirty little secret: its typically low velocity often causes it to perform poorly in heavy clothing. Some bullets do perform well, but many fail to expand when fired through heavy clothing. Calibers such as 9mm Parabellum benefit from higher muzzle velocity when fired from a service pistol length barrel and that can somewhat make up for less than optimal bullet design.
In this test, we find that the lighter weight bullet helps to achieve higher velocity, which in turn, helps to achieve reliable expansion in heavy clothing. Were this a lead core bullet, that lower mass and consequently lower sectional density might also lead to inadequate penetration, especially when fired into bare gel. It’s a difficult balance to strike: reliable expansion in heavy clothing and adequate penetration in bare gel. That’s because, if a bullet expands more readily,…This post was originally published on this site