I guess I might get my Long Range Hunter Card revoked for saying this but I've been using the Lee Collet dies for sizing my necks for several years now and have found that I couldn't improve the accuracy I get when using them with any other die sets I've ever owned. They save mountains of time in the reloading process.
I still use Redding Competition seater dies to seat bullets though in most of my favorite chamerings but I still have a few older ones that are mostly plain Jane still hunt cartridges that I use your basic plain Jane RCBS FL die sets on.
I took a couple of my cartridges from my favorite shooting rifles to a local bench rest shooter a few years ago and he was going to show me that runout was too much with my Lee Collet die neck sizing routines and he he came away a believer... Less than .002" if I remember correctly. He was impressed... I've never invested in runout or neck thickness gauges because that's just waaaaaay to anal for this old redneck shooter.... LOL
The reason I got started originally with the Lee Collet dies was because I could take the brass directly from my vibratory case cleaner and use the Lee Collet dies to do all the sizing I'd ever do on those cases until they started chambering with difficulty. Case life improved and I didn't need to use ANY case lube at all after the first FL length sizing with new brass or subsequent FL length sizing to reset shoulders!!!
After using the Collet Die I use the RCBS multistation case prep center to lightly rechamfer the inside and outside of the neck mouths and clean the primer pocket and to use a nylon brush to clean the inside of the case mouth.
Because my favorite long range rifles and the only ones with expensive brass (one and the same) are of the SAUM variety, I sometimes do a full length resize after they start chambering with difficulty but rarely get more than 5 loadings before I chuck them. I just don't like to worry with old brass or annealing.
I usually just use Remington or Winchester brass for my rifles although I have some Lapua brass I'm ready to try... None of my rifles are Custom Gunsmith made (yet) and none of them have special chambers or tight necks.