Either start with the Rems (they all load the same) or the Win AA (needs care in selecting loads), but not both. In the Rem category, there is debate over whether the Nitro/STS are better than the Gun Club/Field and Clay. The former have all brass bases and the later either steel or brass-washed steel. I load both Rems (all types) and AAs and both load fine. I color code different loads using the various Rem types and the AAs all get commingled, color-wise (3 colors: red, dark gray and orange). My favorite is the AA. The shiny, slick, oily plastic seems to flow better through my reloader.