Trimming Brass, Frankfort Arsenal Universal Case Trimmer 

This is what I use to trim. I like it. Trimming short cases like 6 arc is hard on my fingers tho so I wear a tight fitting knit/rubber glove and that helps alot. I’ve noticed with mine that if I don’t rotate the case while trimming I usually don’t get a flat 90 degree case mouth but with some rotation it is. Doesn’t take any longer. Very fast way to trim and pretty consistent on oal. 90% are within 2-3 thou

There's nothing that makes trimming brass enjoyable but this works good for shoulder cases. I used to just use a file.

I started using that about a year ago too. Faster than using the Lee case length gauges. It can be hell on the hands/fingers if you’re doing several hundred cases, but if brass prep was easy, I’d shoot way too much!

I just bought one of those. I haven't tried it yet.

I use the lee case gage those work pretty good for the money. And not a lot of messing around with anything. It's the easiest way I have found to trim brass.