After what seemed forever I got down to pa with the tac 20 I built on a Sako Varmint.. Accuracy has been best with the Sierra 39 grain BT green tip bullet..It is deadly out to 300 plus yds..For a tiny bullet it really hits hard !! I'm taking the rig to washington county next week for more testing...Once I figure out the drop values out to 500 yds I'll try some longer shots with it... mike in ct