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RE: Armor to stop bullets

You can fire a 22LR at 1/4 inch plate all day and it might scratch it.
Penetration has to do with composition and velocity of the projectile.

This is why A10s in their 30 mm GAU-8 Avenger rotary cannon uses a slug consisting of a lightweight aluminum body, cast around a smaller caliber depleted uranium penetrating core. That will go well beyond its diameter. :-)

A full metal jacket high speed military round out of a carbine or greater would probably prove your estimate accurate. Bubba and his .30-06 deer rifle from 100 yards, probably not so much.


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