Thanks again for the input guys. Much appreciated. I dont have any 300 RUM dies to to size the neck for turning. I do have a 300 WSM neck die and actually ran a 300 RUM case through it to get a nice round neck and it worked pretty good. I will turn one of these necks and get the OD and then order the bushing that is equal in diameter which "should" get me about .002 tension. If it's not enough tension, then I'll order another one.
How far down the necks should I turn them? I'm thinking about .050 within the junction of the shoulder. I was planning to size to leave a doughnut at the bottom of the neck to center the case into the chamber.
Dirtball, I am planning to get the set you described, seems like the way to go to me.
Will also be getting the TN bushing, what's another $10?