Rohann-
Your normal everyday barrel rifling features about a 90 degree angle between both sides of the rifling root. IE: Where the groove is cut beside the land is about 90 degrees give or take.
Rock Creek 5R barrels feature an angle to both sides of the rifling root. The angle between the top to the side of the rifling is about 45 degrees. This is reported to increase barrel life and improves the seal between the round and the lands, thus increasing velocity and reduces fouling. Some say it also results in less deformation of the bullet jacket.
Mike makes the barrels of Pratt & Whitney twin spindle hydraulic rifling machines.
The barrels shoot so damn well I don't care if he rifled them with a dull carrot! They just (no pun ROCK).
Dustin -
Did not mean to put you last as this is your post,,, (well I ended up editing the post so your not last!)
My choice is the Lilja barrel. I've never personally owned a Lilja but know several who do. Anyone I've known that has had one has loved it and had great life from the barrel. Very tight tolerances during the manufacture process and solid reputation behind the maker.
Given the above I hear Tedd is cranking out a good product these days.
LRC -
My choice was based on the advice of HWSNBN, as well as customers such as yourself who have had great success with his barrels. I figured what the hell, lets give one a rip!
My new Tacital Rig, to be built after the 300WM, will feature the venerable Rock Creek 5R, M24/M40 contour barrel. Just can't mess with the mojo!