smoothore,

While not 0.22", I have just chrono'ed my 1948 0.177" Original Model 5, and my 1978 Diana Model 5G with RWS R10 Pistol pellets (6.99 gr.) :

1948 Mod 5 - 450.4 fps / 3.15 ft.lb

1978 Mod 5G - 486.5 fps / 3.66 ft.lb

So, with a 0.22", you could expect at least 3.2 ft.lb ?

Have fun & a good weekend

Best regards

Russ