I had a Ruger American and there are many out there that people rave about but mine didn't shoot that great. At the time, I had a Tikka and a Mossberg MVP and they shot groups at least half the size. I tried 55 FMJ, 69 grain, and 77 grain handloads without success. The action was nice, trigger was decent, and I liked the rotary magazine, but the stock was awful.
I now have a Remington 783 that I paid $300 after a rebate if I remember correctly. The first one I picked up shot terrible, keyholing at 100 yards, so Remington replaced it. The stock and magazine are nicer than the Ruger, and I have shot the Federal 62 grain 5.56 ammo in it without a problem. They are a 1:9 twist and I have shot the 70 RDF and 62 and 75 Hornady BTHP bullets in it, groups usually average .6-.8 MOA.