I tried to load .308 rounds last night. Using my new LEE collet die on once fired brass. I resized deprimed, did all the prep work i usually do. Cases are to spec. Case neck mesaures .306.5. Throw my powder and begin to seat the Sierra 168 HPBT. Seat 6-7 bullets, then this happens. I check my die adjustment and everything, only to get it smashing the cases worse. Before it all went bad i did have trouble getting a consistent bullet seating depth. I am baffled i have loaded thousands of .308 and never had this problem. Have never adjusted the body of the seating die because i use the breech lock press and the die has the micro adjustment knob for bullet depth. Could it have something to do with the collet die? or the die broke? or ME. Thanks Wanna kill these ads? We can help!