Good luck with your reloading. Would recommend that you clean your cases before depriming. That keeps dirt and powder residue out of your dies and prolongs their service. I use a vibrating tumbler. Some people don't clean their brass before depriming, everybody does it differently, and that is fine. Second what Tom said, get a micrometer. It is an important tool, probably on the most used tool in reloading and over all cartridge length is important.