Has anybody ever come across or had experience with 45 acp brass jacketed bullets? I have come across a bunch at the building my company has me tearing down( old UPS wearhouse. LOTS of free ammo from it falling out of mail order boxes). I have found about 100 230gn 45acp bullets, took them home and tumbled them to clean them up and they look like they have a brass jacket instead of copper. Never seen this. Thought I would ask the croud.