I only know of one person who claims to trim pistol brass. In my experience, they tend to be shorter than the max length anyway. I also never clean primer pockets - since I load on a progressive press and I don't have access to the primer pocket between decapping and setting the primer. I don't know anybody who messes with the primer pocket (except for possibly the guy who trims). Actually, that's not true, I deburred the flash holes and uniformed the primer pockets for a bunch of cases for loading the Army bullsey load (185 Nosler JHP, 4.1 gr of VV310, Federal match primers). I figure if I'm spending that much to make the bullet, I would go all out
. I doubt it made any difference other than the blisters on my hand!
Normally I clean them and load them and that's all. They shoot pretty straight for me.
Good luck!