I recently bought a S400 Classic with an extra long air cylinder.
The rifle shoots very consistent with a spread of approx 15 ft/s.
My problem is that it chrony's at avg 740 ft/s. This = 10.3 ft/lbs with JSB pellets. I have tried the grub screw adjustment on the right of the rifle, but it makes little or no difference to the power.
Can someone please supply me with some tuning info/doc's, or point me to a web site where I can find the info required to up the power closer to the 12ft/lbs mark.
I know there are guys that can tune it for me, but I would like to have a go at it first, if I can get the required info.