For the .357 & .44 Magnum, I have some mixed headstamps for light to moderate plinking loads, which I do not trim. The difference in crimps isn't noticeable. However, brand new Starline brass is kept separate and gets trimmed for full power magnum loads.
Recently started loading for the S&W .500 Magnum and all I have is brand new Starline brass, which I trimmed before use.
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