I have been loading pistol for a while (with a square deal) but stepped up to a 550B. Have done a lot of .45 and .357 on the 550B and have beed satisfied with results. I have 223 dies for the 550B and have tried a couple of runs with less than stellar results. My Savage Bolt takes um ok but the bushmaster DCM and Rock River Arms AR. will not chamber properly (Jams into chamber but not far enough to fire) I'm trying to load 60 gn V-Max and Sierra 69 gn Matchking Molys. when they do function I get good velocity numbers. Trimming with a Lyman universal trimmer to specs. I have seen some threads about sizing then reloading (Dummy me I thought you could do it like Dillon says in there ads) so I think I'll follow those recommendations. Questions: 1) Trimming/chamfering is there any good ref info on proper trimming and chamfering without spending $425 on a Giraud. 2) Anyone using the RT1200? how do you handle chamfering? 3) Anybody got a good recipe for the 69 gn Matchking 4) How do I get them to function in my ARs?