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Some sizing dies size tighter than others. As others have said, bulging around the bearing surface is normal especially with cast bullets. Eccentric bulging is not. I had this condition once and found it to be a bad sizing die. You may want to measure a sized case and see if it's concentric. I bought a new die, measured a sized case (it was concentric) and my problem was solved. I'm not saying that can be the ONLY problem, but it's a simple to check.
Crazylegs
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