No. That's for when the same dies are used in the 650 and 1050 machines. Those presses are typically used with case feeders, which may or may not precisely locate the cartridge case in the shell plate.I was wondering about smooth feeding into the dies the dillon dies I have seen are flared a bit at the mouth for smooth operation of the press. I did not know if by using rcbs dies I would create a rough or alignment issue on upstroke sounds like that is not the case good tip on the dillon lock nuts.