Little secret you actually want a little carbon or all left in your case neck.benchrest and f class guys don't clean inside of case necks cause of cold welding and inconsistent neck tension .not much of a factor in hunting ammo but if you want to be the best at tiny groups you play the game.
Definitely will never use stainless pins in a rotary tumbler myself but I shoot as much as I hunt and like to know what the competition folks are doing.the OCD folks shooting $7k rifles are doing
All depends on what you're doing