1. For the auto loading actions I would recomend sticking to either a FL resizing die or small base. For bolt actions you can go with a neck die, but if you do you'll still need to use a FL die to push the shoulders back .002" when brass becomes too tight. This usually happens after 2 or 3 neckings.
2. It is necessary to maintain brass trim too lenghts with bottle neck brass! If you don't keep it trimmed to or below max length it can cause an already high operating pressure cartridge to spike excessively high.
4. Make sure you ream and chamfer the mouths after trimming.
5. When lubing bottle necks don't use excessive amounts of lube, and don't get lube on the shoulder of the brass or you'll end up with lube dents. I also recomend very lightly lubing the inside of the necks.
GS