The group size I would be happy with depends on several things. Firing position makes a big difference. Offhand will be more difficult than prone or from a bench. Another factor is how fast you are shooting. Rapid fire is going to open up groups but I would look for a balance of speed and accuracy.
Shooting that rifle slow from a bench or prone I would expect all the shots to be within an inch or two at 25 yards. Shooting offhand and fast, I'd be happy with a group of that stayed in the nine ring. If the group was well within the ten ring, I would think I wasn't shooting fast enough. I hope this helps