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From my understanding, anything above 1500 fps. At that point, gravity begins to take over and trajectory begins to drop, causing a tumble when the round impacts. It also depends on the angle of entry. The source I'm using is a member of a US Army ordnance depot in Anniston AL. I usually get ahold of him whenever questions like this one come up. Interesting query, I like the ones that make me "look it up"!
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