Most of the professional ballisticians I’ve spoken with agree that a projectile’s rotational velocity has little effect on impact expansion. However, some point out that since rotational velocity maintains itself much longer than downrange velocity, it must, to some extent, affect expansion via centrifugal force.
Therefore, rather than simply loading down to simulate 400-yard impact velocities (which has the unavoidable side effect of reducing rotational velocity), we set gel blocks out at 400 yards and shot them.
