I put a slug down the bore of my SSH and the lands measure .222, the groves measure .224. The cylinder gap is .004. With the right 22mag ammo it's a tack driver. 22lr is all over the place. I heard these things had some kind of compromise bore diameter, but this specs out to 22mag, which would explain the poor 22lr accuracy. So I guess these are 22 mag dimensions with a 22lr cylinder for kicks? Or is the bore off?