3/8" to 1\2" c to c . You could shoot better, but the trigger holds you back. I've gotten sub dime size 10 shot groups with good wadcutters, rested, but offhand, the trigger fights you.
Because it's a trigger and not accuracy issue, 20 meter doesn't double the group size. Last night, took it ratting and it's minute of rat out 20 meters, with the open sights. Much fun, you can chase them as they run!
Highly recommended, bang for buck winner!