The high primer issue in the STS hull is indeed an issue between the nose profile on Remington primers being radiused and other primers which are not. When Remington fits the base to their hull they somehow use heat which generates a large melted plastic burr at the end of primer hole that pushes any non-radiussed primer(WW) back out a bit, which is, as you have learned, is very aggravating. You can remediate the issue by taking a General brand tapered reamer and removing some of the burr on every hull. Been there on this one, especially, I think on STS 28ga hulls. Get rid of that burr and the issue is solved, but it's a time-consuming project. I do think that, in general and with the exception of the older and heavier WinAA hulls, the STS are the best small gauge hulls, though, so I have actually reamed a large batch of mine. The newer Win AA 20ga hulls generally last no more than 2 reloads for me, and often not even the original firing, before splitting at the mouth.
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