Jeff, I checked it after shooting it for a couple days and was getting between 750 and 760. I forget the exact numbers but she was within 10 fps deviation with CP's. I shot 10 through the chrony at that time. I was in my shop with K-1 heater going and it was at least 70 degres or higher in there..

I have found that is a great place to shoot from when I want to shoot the 850 when it is cold outside..

Guess that is cheating but it works..

Also I have been shooting at a 20 yard target and keeping it in a one inch group. I get kinda bored and I pick up one of my springers for a while and then go back to the 850..

It is not quite as accurate as my FX Cyclone but close at 20 yards..

I think the biggest difference you will find between the 850 and your QB's is that you do not load one pellet at a time. The cocking is smooth and easy on the 850..

So that means when you are hunting that you do not have to reload when one of the critters runs off...

Which I am sure you do not have that problem with your dead on marksmanship..
Hope that helps
Gene