I'm new at loading 223. Loading all other standard rifle calibers, no problem until I get to Lake City brass. It has a military crimp. I buy the RCBS crimp remover and stick in on my case prep center and grind away. Trying to work up some good loads using 68 gr BTHP Hornady bullets for one of my AR's. I figure 50 rounds should be a good start. Go to seat some primers and they won't go in and crushed/folded them. I quit after 9 pieces. What am I doing wrong? Maybe ought to just pitch the whole bucket and buy new. This stuff is worthless. Yes, frustrated.