Question: An old-timer at the range gives me a clay-target-sized box of 30-06 brass. It is primed, the primers are UNFIRED, crimped and the brass appears to never have been loaded or, VERY clean pull-down. There are 390 pieces and all are headstamped DM 45. Ideas please: Where is DM? Load it; shoot it? Soak in water and deprime, uncrimp? RSVP; all help appreciated. Geoff in DE