That is the nice part. To form cases, you simply run them through the sizing die just like you would with fired cases. It is a one step deal that is no different than sizing a standard cartridge. Since you are only necking down one size, you don't need multiple steps, multiple dies, or fire forming. My dies are a Redding two die set. You are necking the case down so little, it doesen't feel any different than a normal sizing/depriming. It keeps the regular 243 Winchester shoulder so there is no fire forming in that aspect. I need to try the new 80gr Amax in my gun, but I hate to change anything with it since it shoots so good.