Will a .357 Magnum Penetrate Drywall (Gypsum)?

Yes — defeats a 13 mm drywall (gypsum) barrier
Penetration depth
340 mm (13.4″)
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 340 mm (13.4 inches) into drywall (gypsum). That is enough to defeat a typical barrier of this material — treat anything behind it as exposed.

About Drywall (Gypsum)

One sheet of interior drywall is ~13 mm; a wall is two sheets and a gap.

.357 Magnum against other materials

MaterialDepth (mm)Depth (in)
Red Brick99 mm3.9″
Concrete54 mm2.1″
Tempered Glass14 mm0.5″
Steel A362 mm0.1″
Steel AR5001 mm0.0″
Run your own numbers in the calculator →

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