I have been reloading for almost a year now and have gotten everything down pretty well with .223 and 40s&w. I just acquired a .308 and I have been looking at does for my rcbs hand press. What does do I need and don't I need. I will be shooting out of a savage bolt action. I was confused by some sets with 3 die sets compared to 2 die sets. As well as small base large base and full length dies.