Hi Sarge,
Assuming you are using something like an RWS SuperDome in 22, in your rifle, then you would be averaging something like around 590-597 FPS, running at 11.3 - 11.4 Ft/Lb? I am guessing as to the pellet type you are using, but i did my calculation using the 22 RWS SuperDome as a pellet type. DJ-N-gage and I are pretty much looking out the same window here i think? lol
If you can be a bit more specific as regards what pellet you are using, then i can get a better answer for you mate.
Regards,
Grim.
hi mate try this simple formula this works for all ballistics