I do trim mixed revolver brass for more uniform crimps.
Sage advice Fred lolI've been reloading since 1963 and have only trimmed 5 Federal 357 Sig cases, just because I wanted to. My round count is well over 750,000+ rounds, and those five cases are the only handgun rounds I've ever trimmed, or ever will.
Life is too short to spend it trimming pistol brass.......
Hope this helps.
Fred