How deep does a .357 Magnum penetrate Ballistic Gel 10%?

At the muzzle, a representative .357 Magnum load penetrates approximately 441 mm (17.3 inches) into ballistic gel 10%.

What is the impact energy of a .357 Magnum?

This .357 Magnum load carries about 796 joules (587 ft-lb) at the muzzle.

Ideal penetration (17″, within FBI 12–18″)

Penetration depth

441 mm (17.3″)

Impact velocity

395 m/s (1296 fps)

Muzzle energy

796 J (587 ft-lb)

Bullet behaviour

Expanded

Fired at the muzzle, a representative .357 Magnum load (10.2 g, SP, 395 m/s) reaches roughly 441 mm (17.3 inches) into ballistic gel 10%.

10% ordnance gelatin is the FBI reference medium; 12–18 in (305–457 mm) is the accepted penetration window.