I personally use the Lee Die Set (full length). In my M1A, I've never had any issues using a full length resized reloads in my guns. But there are people out there that will need to use the small die sets.
I have always loaded with RCBS dies and have thousands of rounds thru the .30-06 set. I got small base for my M1As and they have worked fine. Just bought an XDIE and have loaded a few but have not used it enough to determine if there is really any advantage.
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