@Mr. Stangfish: No, You're not out on any twigs or branches. I thought the same thing, but if the barrel manufacturer cut the dimension between the top of the belt and the shoulder correctly, things should work OK.
If it's a little long, then do as you say. Adjust your die to headspace off the shoulder. If it's a little short then things get problematic. I have a .300 Win Mag and it's shoulder is cut to minimum tolerances. Two different sets of dies would not work and I finally had to grind a couple of thousandth's off the shell holder and then adjust the die for headspacing, as you suggested. This is why I hate belted cases.
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