When I started reloading back in 1970, I did .30-06, .22-250, .222, .30-30 and .44 Magnum cartridges, and trimmed them all using one of those Forster trimmers. I sold off my equipment some years later, but started up again when I recently retired. A few things surprised me upon re-entering the hobby. One, a Forster trimmer is outrageously expensive this time around! Two, many posters on this and other forums claim to never trim their pistol cases!
Hey, they all grow due to the resizing process, even the straight-walled handgun brass. There was several occasions where, if I failed to check my .44 brass, the crimp would fill the cannelure of the bullet because the case was too long. Everyone here knows that rimless semi-auto pistol cases headspace on the case mouth, so the length is really important with those calibers. Is there any justification in not trimming the brass? Or is it like those that don't clean the primer pockets? (but that's another issue)