I've bough a bunch of stuff over the years that I don't use anymore. Here are the must haves.
RCBS chargemaster
Forster case trimmer and 3 way cutter
K and m neck turner set
Vibrating tumbler
Ultrasonic cleaner
Collet bullet puller for your press
Dry neck lube
Annealing: Torch, 750 tempilaq, k and m shell holder for your drill
Set of hornady ogive measuring inserts, and set of hornady shoulder bump inserts
Turn necks on brass just where you get 100% cleanup, after you fire the brass throw it in the vibrating tumbler, take it out and deprime it, anneal it with your drill set up (giraud is 10x better and worth the money), drop it straight into the ultrasonic cleaner, dry the brass in the oven or food dehydrator, now fl resize with bushing dies and bump shoulders .002 measured on your hornady insert, trim the brass on the forster trimmer, dip necks in dry neck lube, wipe lube off outside of neck, seat bullets and measure to the ogive with other hornady insert.
I used to never be able to get ammo under .75 moa, now every gun I own will shoot .25 moa by doing these steps. I have a rcbs case prep center that I never use anymore. Turning necks and using redding bushing dies were the biggest improvement to group size and I've used every type of die out there.