Was watching Iraqvetern888 video on trying to blow up an old rossi 410. All I shoot is brass I reload, 9.3x74 and 444 marlin. Watching him send downrange 45 colt, 454, 444 marlin got me to thinking. He reducing 45 down to 410 that is a no no. I'm doing it with a brass shell with bird shot. Why is it OK with bird shot and not a solid bullet?