You don't. Just coat them with Lee tumble lube, thumb press into a unsized case, and shoot. BTW, #0 buck works in my 30 cal. rifles. #1 is too small. I also drill out the flash hole on cases designated for this, I get better accuracy and the primer doesn't back out as bad. Loads are in the range of 2 grains of Bullseye in the 30-30 or 308. One hole groups at 25 yards, very little noise.