How deep does a .380 ACP penetrate Water?

At the muzzle, a representative .380 ACP load penetrates approximately 1948 mm (76.7 inches) into water.

What is the impact energy of a .380 ACP?

This .380 ACP load carries about 261 joules (192 ft-lb) at the muzzle.

Penetrates to ~77″ before stopping

Penetration depth

1948 mm (76.7″)

Impact velocity

290 m/s (951 fps)

Muzzle energy

261 J (192 ft-lb)

Bullet behaviour

Intact

Fired at the muzzle, a representative .380 ACP load (6.2 g, FMJ, 290 m/s) reaches roughly 1948 mm (76.7 inches) into water.

Water is a dense fluid medium; bullets destabilise and shed velocity quickly.