Will a .357 Magnum Penetrate Tempered Glass?

Yes — defeats a 6 mm tempered glass barrier
Penetration depth
14 mm (0.5″)
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 14 mm (0.5 inches) into tempered glass. That is enough to defeat a typical barrier of this material — treat anything behind it as exposed.

About Tempered Glass

Tempered and automotive glass runs about 6 mm thick.

.357 Magnum against other materials

MaterialDepth (mm)Depth (in)
Red Brick99 mm3.9″
Concrete54 mm2.1″
Steel A362 mm0.1″
Steel AR5001 mm0.0″
Aluminum 606110 mm0.4″
See exactly what .357 Magnum does to Tempered Glass — open in the calculator →

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