Wilson will custom make one for you, for a mere $50 or so. I had the same trouble with .400 Cor-Bon, which is of similar design to the .357 Sig. I take out the barrel of whichever of my guns I'm loading for and adjust the die so that the case is either flush or just a couple of thousandths under the rear surface of the barrel hood. Of course, I'm loading for Glocks and a Colt Gold Cup. I've fired thousands of rounds with no problems.
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