Originally Posted by Mauser34
I'm looking at a 20 inch tube because there are almost no barrel vibrations and it would be easy to carry around on a hunt and Shilen because its been recommended to me by a lot of people.
Go with a sendero taper, or maybe as light as the #5 or #6 Lilja contour and you'll be a lot happier in the end. Also go with at least 26-28" so as to maximize velocity without pushing pressures.
Also I'd say go with a 1:9 or 1:9.5 twist so you can shoot the heavier VLD's. You'll need a little tighter twist with the .300 NM than you would with a 300 Rum or 30/378 to stabilize the longer/heavier VLD's since your velocities will be a bit lower. Remember spin or RPM is a function of both twist rate and velocity.
As for barrels, I'd recommend Lilja, Benchmark, and Krieger over Shilen and certainly over Douglas. I've known of a lot of people that ended up terribly disappointed in Douglas barrels.