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I like to load my 10mm rounds with Power Pistol powder, as even if the bullets are moving at only .40 S&W velocities, I still get full 10mm-levels of shock and awe.
Jeff Cooper's intent for the 10mm was a 200gr bullet with an impact velocity of 1000fps. Assuming a 50yd limit, that would be 1050fps at the muzzle. A far cry from the "magnum" rounds cooked-up by D&D and Norma.
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