.957 outside to outside. Using JSB express, leupold 6.5x20, no wind. Had one that started out great( don't they all) at .755 till the last one then 1.020". I know this gun will do better. Better rest and smaller aimming point. Not too shabby for a 12ftlb gun. I post a pic as soon as I can. The only whitness I have is "Beemer" my lab. He's pretty honest.
This gun stacks right up at the top of the heap. I know my USFT will beat it but that gun pushes 20 ftlb's. Those guys across the pond only shooting 12 ftlbs are some great wind readers. It doesn't take much at that power level to move things around.

Toe-Knee Ess