How deep does a .44 Magnum penetrate Water?

At the muzzle, a representative .44 Magnum load penetrates approximately 1143 mm (45.0 inches) into water.

What is the impact energy of a .44 Magnum?

This .44 Magnum load carries about 1248 joules (920 ft-lb) at the muzzle.

Penetrates to ~45″ before stopping

Penetration depth

1143 mm (45.0″)

Impact velocity

400 m/s (1312 fps)

Muzzle energy

1248 J (920 ft-lb)

Bullet behaviour

Expanded

Fired at the muzzle, a representative .44 Magnum load (15.6 g, SP, 400 m/s) reaches roughly 1143 mm (45.0 inches) into water.

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