I do not sort headstamps. I do segregate nickel from brass cases. The reason is that the nickel cases clean much faster in the tumbler than brass, and excessive cleaning can wear the nickel permaturely. The military headstamps need the primer pockets reamed the first time. This isn't much of an issue with revolver ammo where you get your own brass back every time,but with auto cases, you may do some trading at the range. (As well as accumulate a few extra, hopefully) Some headstamps, such as Amerc, need to be discarded, as they are generally way out of spec.