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Some combinations of dies and cases give this "coke bottle" effect. I started experiencing it with .357 Magnum using Lyman dies around 35 years ago. Some other calibers I load show no trace of it. Since it doesn't affect the performance of the ammo, I don't worry about it.
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"Dear reader, suppose you are a member of Congress. Now, further suppose you are an idiot. But I repeat myself."
- Mark Twain
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