How deep does a 12ga Slug penetrate Water?

At the muzzle, a representative 12ga Slug load penetrates approximately 965 mm (38.0 inches) into water.

What is the impact energy of a 12ga Slug?

This 12ga Slug load carries about 3538 joules (2609 ft-lb) at the muzzle.

Penetrates to ~38″ before stopping

Penetration depth

965 mm (38.0″)

Impact velocity

500 m/s (1640 fps)

Muzzle energy

3538 J (2609 ft-lb)

Bullet behaviour

Intact

Fired at the muzzle, a representative 12ga Slug load (28.3 g, SLUG, 500 m/s) reaches roughly 965 mm (38.0 inches) into water.

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