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Mark,Well I just checked the math...
It seems 16 Joule = 11.8 foot-lbs (fpe) http://www.onlineconversion.com/energy.htm
Then I found this handy formula:
If you plug 11.8fpe in there and say 6.94 grain for the weight of a .177 RWS
super-H-point you get 875 fps.
You need 30 Joule = 22 ft-lbs with that pellet wt to get 1200 fps.
Now how you calculate effective range I'd like to know....anyone have