I was given a bunch of '43 head stamped 30-06. FMJ, Tracer, and AP. Ran some through my M-70. Didn't clean it that day. Cleaned it the next day and it looked like I hadn't' done it in months. The old Mil stuff had corrosive primers. Pulled the bullets, popped the primers and reloaded. If you shoot it clean as soon as finished.