Ruger has had a big problem with some of their MK77 mark 2 SS in the barrel area. They farmed out some and made a big mistake. I had one in 260 caliber and loved the rifle except that it just wouldn't shot consistant groups. Through one summer I tried factroy ammo in two different weights, 5 different powders, two different casesand 4 different bullets in reloading and never did get it to shoot right. I had an expert gunbulider check it out and he said it was perfect. I was going to send it back to Ruger when a man wanted to buy it.I told him up front about it and he said he liked a challenge. I would shoot anywhere from1.5 to 2.5 inch groups from the same loads. I once shot a 3 shot group of .875 and thaought I was on the way. Went home, loaded up some of the same and shot 2.5. Nice rifles and if you get one that will shoot a good group-great!