Well, it wasn't me that rechambered it, but I recently came into possession of a 12" 28gauge rifled pistol barrel that I was told came from a former muzzle loading barrel. It's ported and makes a ~16"pattern at 10 yards. At 20 yards there are game sized holes in the pattern. It's got a solid rib with a 2 bead sight. I think the sight is probably the only real advantage over the 45/410 barrel. Recoil is mild with little flip. Should make a nice trail walking/biking grouse barrel.