l hear every one talking about what to do with a case, does any one either inside neck ream or out side neck turning a case l know l do, l in side neck ream. The primer gives me an indication as to if there is something going on, and if it didn't look right and l didn't change my load and if the expander button is tight
that means brass flow and there is no other way to cure or fix this problem other then reaming or turning; l learned this the had way; l was flattering primers and had excess pressure l was new to this game of reloading in the early 70s so after a half dozens reloads of the 22-250 l chucked 100 shell figured that was the life of the case, some one l new at the range picked up the brass and asked if he could take them l told him they were no good and what the problem was. Next weekend he hand me a box of 22-250 with the same load that l had use and sad try them, worked fine l told him, his reply was that's your old brass all l did was neck ream them.
l made a call to RCBS and ordered 22-250 neck reaming dies and still have them and that guy gave me the other 75 cases and you can do the rest. There was on googling back then. READ BOOKS AND ASK QUESTIONS STILL WORKS TODAY.