Hey guys, the other day I was reloading for a .338 Lapua and encountered this problem... I would do the best I could to make the COL to be 3.9" and the first round would always be perfect after my messing with. Problem was every single round I would make would always be at least 10 thousandths off high or low. This would change with each round high or low. To try to fix this problem I would unscrew it a little bit and start from scratch, but I always ended up the same thing, frusteration. I have this exact same die for a .300 Win Mag and I made 100 rounds a week ago and dame near every one was 3.7" like it was supposed to be. I tried calling the guy at the realoading place where I bought it and he said he didn't know what the problem was, he recommended that I call Redding. Does anyone out there have a solution before I go hit the phone?