Hopefully enough "Eureka" events get documented here to become a Sticky.
If I am posting something someone else discovered in the past, I apologize.
For range brass, and following the system developed by Bruce B (gone but not forgotten) I process 7.62x51 for my Springfield SOCOM by decapping, tumbling clean, sizing in an RCBS X-sizer and then using my Wilson trimmer to cut down each case to uniforimity.
Then comes the less joyful job of removing flashing from the necks and the crimp from the primer pocket. Fingers and wrists were never impervious to repetitive motion but things only get worse with added decades. Staring at the brass "Eureka" hit!
My Wilson reamer is the 17 to 50 caliber one. In the end to trim the outside of necks is a steel pin pressed into the too (neck mandrel). There are 3 (three) cutters - and there are 3 jaws in my rechargeable drill!
The mandrel just fits into the drill chuck! Make sure you run it clockwise (righty-tighty) and in the slow speed (if you have that option). Doesn't work on the outside of the case mouths, but does the other 2 cuts just great.
Please post your own "Eureka" moments that made a case preparation job a lot simpler, cleaner and/or faster.