This video from Autumn's Armory tests the penetration capabilities of various firearms and ammunition types through stacks of encyclopedias. The experiment progresses from .22 LR and .380 ACP, through 9mm, 12 gauge bird shot and slug, culminating in 5.56x45mm M193 and M855 rounds fired from a Desert Tech MDR. The results highlight how different bullet constructions and calibers perform against dense paper media, with the M855 demonstrating significant penetration and retaining its steel core.
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