hmmm... a What The _uck case trimmer??? now I've seen everything.. !!
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get a manual too, if you are truly curious, to find out what all goes into it.. its really your self interest that drives you to reload (also a little anal retentiveness in the details helps).. videos helps a bunch too, but, honestly if you decide to get into it, you really need to grab a manual like Lyman, Sierra, Hornady, etc and read the front section.. a world of info right there in a couple chapters! imagine that, A BOOK !!!
lightbulb
ps.. that is too broad a question,, do some research and get back here, there are plenty of members on here that are more than willing to help out in specifics...