Most accurate that I've ever shot out of the box (with a scope on it) is a Ruger 10/22 Target Tactical.
I reviewed it here if you're interested (
http://thehighroad.org/showthread.php?t=518584 ), but my answers to your questions are as follows:
Please give details of your groups: From 50 yds., I got the gun to group into 3/8" 5 shot groups, and from 75 yds., it grouped at about 3/4".
Rifle make and model, if possible year of manufacture: Ruger 10/22 Target Tactical and I believe it was manufactured this year or late last year.
Scope make and specs, or stock iron: Leupold VX-I 2-7x33
Method (i.e. bench rested, on sand bags etc): Just shooting with the supplied bipod.
Ammo: Winchester Super-X High Velocity 40grn. FMJ
Distance (range): 50 and 75 yards
Group size: See above.
Edit: Also, I meant to mention, when you say "out of the box", I really mean out of the box on this one. I literally took it out of the box, affixed the bipod, mounted the scope, and it sat in my gun closet for a month or so until I could get to the range. No cleaning, no break in; nothing other than the few rounds to zero it and then shooting for groups.