Having some trouble getting my 22-243AI to fireform well on the first attempt. Sometimes it seems to blow out nicely with sharp shoulders and other times it doesn't. I fired 10 new Lapua cases with IMR 4064 and a 55gr Ballistic Tip which was loaded long for a crush fit. The charge weight was heavy enough to flatten the primers (probably too heavy) but only 5 cases formed corectly. The other 5 cases have very round shoulders and look just like that new 5/35 SMc case. Any suggestions?