I shoot a 835 with a Jellyhead and H-13 3.5" 2.25 oz. #6 and get around 220 avg. @ 40. Tried a SSx and Stardot and got slightly less in the 10" (like 215 avg.) but not as even. My first shot with an SSX was 266 though but could not get that to repeat with shells out of the same box. My guess is it had something to do with the choke. I will say that it was not deburred well and the machining quality looked poor. My guess, burrs could have caught wad and acted like a wad catcher which may have helped pattern, poor heat treating and choke deformed somewhat after first shot?? Who knows. May have been ammo but all shots after first in several other chokes all seemed fairly consistent.