That's impressive, especially coming from a Ruger! I never could get mine to shoot better than 1" 5-shot groups (7mm-08) and the best bullet I shot was the 168 MKs. I killed a lot of coyotes with the 110 TnT. This was in the day that 284 brass was so horrible and that's why I didn't go that route.
I am still waiting on my action for my 6.5-284, but am somewhat tempted to do a 6.5-06 imp. I guess I can use Lapua 270 brass and have some good components and it's good for an extra 100 fps over the 284 case...