My specialty for a few years was radioactivity, and the potential of biological damage to tissue.
9mm would be like the X-Ray or lower energy Gamma Ray.
.45 would be like a Beta Particle.
.50 would be like a big honkin’ Alpha Particle
LOVE the little face on the 50AE... Haha!!!
5000 feet per second? Guessing those must be some "warmish" handloads, fired through a looooong barrel (or maybe rocket-assisted projectiles ;^)...