Atkinson barrels were considered to be among the finest of the cut-rifled barrels when I started gunsmithing in the late seventies. My feeling was that they were not quite as consistent as hart or Shilen select match barrels. In other words. out of ten barrels, maybe six would be true BR quality barrels while maybe eight of ten Hart or Shilen barrels would be. That was only my feeling at the time, however, and doesn't really count for much.
Today, I have one A&M barrel on a prone rifle and it shoots very well and never fouls. I'll hate to see it wear out; if it ever does (I don't shoot it too much). GD