Hi guys, just a couple of questions regarding some once fired brass that I picked up at the gun show Saturday. I bought 200 223 for $12.00. About 100 of these are Federal, at least I think they are. Head stamped F C 223 Rem. I tumbled the whole lot and FL resized them. I set up the trimmer and most of the Fed brass was shorter already than the trim to length, some were even .010 shorter. There was no sign of them being trimmed before, as the edges of the case mouth were rough like factory brass, they had not been worked on with a deburring tool. Anyway, do you think it's alright to load and shoot these, or should I cut my losses and recycle them? There was also 50 nice Remington brass and 40 LC and 10 mixed up. If the LC brass head stamp is just LC on top and the year on the bottom, so how do you know if it's 223 rem or NATO brass? I never used to buy once fired brass, but times are tough. Many thanks for any replies.

Irv