I'm a newby,so take it for what it's worth but I've been buying the Forster Benchrest dies because the seater uses the sliding bullet sleeve guide that supposedly helps with alignment. It basically works like the Redding but is cheaper. The micrometer dies are nice but I don't think necessary. You can get where you want to be by slightly adjusting the seating screw and measuring. All you might have to do is pull a bullet on your dummy round if you wind up seating deeper than you wanted or either build another dummy round for a longer COAL if you decide to go that route.
What the micrometer dies do is to instantly allow you to adjust exactly where you want to be from the lands when you find that spot. You can do the same with a stem screw,it just takes longer and a lot more measuring.( at least that's my understanding,anyone can correct me if I am somehow mistaken).
