Never cut below .014" I always say unless your chamber is made for that. I ahve seen bad brass where it varies .012 to .018", but I will stop at .014. You go much below that, and you will ahve to buy bushing dies to size your neck enough to put enough tension to hold your bullets. I like the sinclair kit the best.

But to do it properly, you have to first size all necks with a neck expander mandrel to be accepted to your neck turner, then you have to neck turn, thenneck size again cause most likely you necks are too loose to hold bullets and all that workin of the necks has probably knocked them out of round. Not always the case however and you can modify your tools to bypass that step. Some suggest annealing at that point. I don't.

Next fireform, and now you should have some straight even concentrisic necks. I did it fora whilefor some rounds and life got more and more complicated. Won't do it again unless i have a custom chamber. Instead, I will buy bulk brass and cull for good necks, or buy quality brass if available. So much work and hard on the brass.