Ragged Hole Barrels, John Bredderman, he's built one before for me thats a hammer! Below...
This one above listed was using a new reamer I discussed with Dave Kiff at PTG, now that a lot of the guys are running the heavier bullets we came up with a bit more free bore to run them and maybe the new 155 Berger when it comes out. The one below, my original GAP 4S has a bit less free bore. I built both a light weight mountain rifle and the one above with this new reamer and I just don't need two "heavier versions of the same caliber", I've gotten kinda attached to this older kid of mine..