I'm curious as to what would actually happen to a loose media pin inside a cartridge when the round is fired. The surface area of the pin is very small, regardless of its orientation, so the force applied to it from the expanding gases will be small as well. Also, unlike the bullet, there's an easy path around the pin for the gases to take. I wouldn't be surprised if the final velocity of the pin was barely a "dribble", compared to the bullet's velocity.
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