Am I getting in over my head?

[wapiti25]

I like to buy the brass first then you can look at what neck dia on the reamer to give you a no-turn or turn chamber

 

[nfa1eab]

I saw a .272" no-turn neck mentioned sarlier. That sounds correct if you have old Lapua brass. If you will be using new Lapua brass, I would think a .270" neck would be a more appropriate no-turn dimension. I agree with the previous poster, get your brass and measure prior to spec'ing the neck dimension of the chamber.
Ed

 

[Tim Singleton]

I believe the reamer McGowen is using for their savage prefits is a .271 neck.
It works great with the blue box lapua brass.