I purchased a stocked BVSS action with CNC recoil lug and Heavy McGowen .308 1:10" twist barrel from Jim last summer. Great guy to work with....very, very helpful. Don't have more than a box and a half of FGM 175 gr. SMK's through my rig....but I'm easily getting 1/2" five shot groups at 100 yards ( All 5 or 6 so far
.) I'm going to work up some 185 gr. Berger's...hope they shoot as good or better.
All together...I'm more than satisfied with my McGowen barrel and other parts from Jim. I've read that McGowen had a problem with their button for the 1:10" twist in the past...but mine is perfectly acceptible.