Along the lines of RobertSubnet's suggestion for keeping notes , I don't mix my brass. I group my brass into lots and track each time I've loaded it. My personal goal is to not exceed 5 shots out of a piece of brass. First, because not all pieces of brass are constructed the same internally. Second, I always trim and full length size my initial loading. The next four loadings are neck sized. After five shots of out a single piece of brass, it usually