I did a Talon valve mod recently and was slinging Kodiaks at 816 for a ten shot avg. thats over 31fpe. Saw a high of 839.7 all with a 12″ barrel. Its going to a guy with a 24″ barrel and am looking forward to seeing what kind of numbers he gets. Tophat was set at .058 for the best power/consistency. Put a lighter valve spring in there so i lost the curve but gained some velocity and will get a good shot count with the tophat set at .058. I was loosing 1.8 fps per shot on avg. very little difference in the PW adjustment 0-10, was using a 75 gram hammer. Lots of patience to get them just right, lots of shots too.