Re: What barrel for new build?
IMHO you can't go wrong with any if the top makers, brux, bartlein, rock, krieger, lilja, shillen, benchmark and many many more. Those are some of my favorite, the most accurate I've had were brux and krieger. I'm partial to the cut rifled barrels, the twists in them are much more accurate sometimes with the button rifled barrels they are a little off say a 1-8" twist might be more 1-81/4 or 81/2.
Just my .02, hope it helped.