when i form my edge brass you first have to go from 30 to 338 caliber. i do this in 2 steps, the first is run it down over a 308 caliber tappered mandrel to "round" up the necks and it also pushes them out a bit. then i run them over a 338 mandrel. at this point some are very crooked, so much so that you can see it with the naked eye. i simply run them through my FL die, which is custom made by Forster with a 362 neck. they all come out very straight. can you run us through what you do to the brass in a step by step manor so we might get a better feel for what you're doing. my thoughts are if you run brass into a die without an expanding button, and i don't care if it's neck or FL, and it's coming out anywhere near as crooked as you're talking, you've got major problems with the die. again, please tell us all of your forming steps.