I have two case trimmers that I dearly love.....one is for small lots of hunting ammo.....it' s a wilson

The other is for high volumes for prairie dogs....it' s a Forester that stands vertically and the cutter is driven by a drill press.....it can do many thousand cases in a few hours.....a great tool.

BTW, I' m not among the fraternity that believes that case lengths have to be uniform to .001 for accuracy.....but they must be short enough to avoid interference with the lands of the rifling and creating elevated pressures.