Re: Brass for AR-15...Win, Rem, or LC?
All of the above are good. If you're shooting match or long range for groups or something where consistency is key, keep not only the headstamp separated, but if there's a DOM stamp (IE LC 09) then keep them separate on that as well.
If you're just shooting chucks up close (<400) or steel or blasting targets within a few hundred yards then segregate as you feel the need or just load it all and shoot it.