Walkalong is dead on here. A while back I was questioning some of my crimp die use. These threads with pictures set my mind at ease. Take the time to read them. Some day I hope to have as much knowledge as some folks here.All correct, some bullets can be seated and crimped in the same die easily and without damage, doing just as good a job as seating/crimping separately, but some applications require a second step to crimp. And of course doing it separately is easier to set up and readjust later, although I wouldn't say it was hard to do in the same die. I'll post a link to an old crimping post of mine later.
https://www.thehighroad.org/index.p...-and-crimp-in-two-stages.623417/#post-7699828
https://www.thehighroad.org/index.php?threads/universal-clays-and-357.511309/#post-6354182
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Jeff