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No matter the circumstances I highly recommend crimping. I do agree with high performance (upper scale powder tables) a heavier crimp is warranted.
I set the crimp to the same no matter the load for .38 special or the .357 Mag. This way I am not alway adjusting the crimp for different brass. I also trim my brass when warranted so as not to cause crimping problems when the brass becomes too long.
Been doing this since 1979 and never had an issue.
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