I dont see where people can tell its only partialy resizing your brass when its just touching the shell holder, i have a set of RCBS dies for a 257wby that i have adjusted a quarter turn into the shell holder and it only sets the shoulder back .002, I would have no idea if it werent for the headspace gauge, cuz the next die will in the same spot will bump the shoulder back .010, that is why I love the headspace gauge. Anymore I just decided to set all my dies to full length size everytime except my 22-250ai, I get great accuracy and my bolt never has any resistance so its good for me