Lev-Hed,
If I'm reading you right here, the problem may not be the die itself, but the shell holder. Redding makes a set of competition (I didn't name it!) shell holders that are a novel idea. It's a set of shellholders that are set in .001" increments of one another. The idea is that you can set the die with the lowest shell holder, and then adjust a thou at a time by simply replacing the shellholder with the next one in the set. If it's length from datum line that's the issue here, this may be your solution; that or grinding down a standard shell holder yourself. Personally, I'd go the Redding route (yes, I'm lazy), but it's your call. If it's actually a circumfrence dimensional issue, then we're back to the SB body die as a possible solution.
Kevin