That's a swell group - but see how it groups over the next 100 shots and you'll know more about how good the rifle is and how good of a marksman you are. A single group means nothing, or, only a glimpse of the possibilities.
I posted this on another thread:
I became a much better shooter when I stopped focusing on individual group size at a given day at the range. Early on, I even dreaded shooting too many groups at a given range session for fear of seeing big group and messing with my confidence in the rifle or my shooting abilities.
Any 3 or 5 shot groups you may shoot are just a string of shots in the statistical data pool that is all slow fire fully supported shots from that rifle. Some groups may be very small, some may be larger than you'd like, but only after shooting a hundred(s) or so rounds can you get an idea of what the rifle is truly capable of, on average - and that's the key, on average.
I am satisfied if, on average, I can get my rifles in the .5 MOAish area. Some times the stats are in my favor and I'll drop 5 in less than .25 MOA, but I don't stay away from the statistical average for long.