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That sounds good. I am glad you found the culprit. I never found that those Herter's dies shortened the life of those cases. But I did not have alot of experience back then, that is, I di dnot have a lot of things to compare it to.
The dies I had that caused the problem were carbide dies also.
I have had a lot of carbide dies since then and none exhibited the problems those early dies did. Looking back -- and having some experience with different coatings, finishes, carbonization processes, plating; the thicknesses of many of the finishes are around .0007 inch give or take. If a company would apply a finish - that thick on a die without compensating for it the diameter would be about .0014 smaller, which might make things look odd. But in my experience the bulge was mainly cosmetic.
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