The standard shipping container is reasonably tough and like HorseSoldier mentions, they probably won't stop high powered ammo. They will stop low powered rounds or traditional handgun rounds from a distance though. My friends and I shot at one many years ago with stuff ranging from a 9mm Beretta, .357 revolver and M1 Carbine from about 40-50 metres. It stopped all of that but we didn't shoot it with the .22-250 or the Mini-14 because we thought those rounds would penetrate.
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