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This was filmed at a proper shooting range. Michael S. sent these prototype rounds (not for sale) to test out. They feature a three-piece sabot which holds three .53 cal. lead balls. I used a mild load due to the weight, the limited capacity of a 3“ hull, and to avoid excessive recoil for the shooters. I also anticipated the sabots might also be fragile and could break from “g-shock“. You'll notice the lack of shock-waves in the long-range tests since these were sub-sonic. Jamie's Youtube channel:
