I really like my At-one. I have the 20" barrel. It shoots all of the "good" ammo well, SK Standard Plus, Eley Team And of course the expensive stuff like Eley Match and Center X. I've had good lots of Sport where it shoots very well (like your groups) but I also had lots that would shoot better than any other ammo with the exception of one flyer, every time. Drives you nuts. TC