Roundball will be a bit less, but the 360gr boolit I cast (right)
http://i361.photobucket.com/albums/o...mmer/003-1.jpg
Fired from this...
http://www.bgmfairguns.com/thumb%20rifle.jpg
With a 3500psi fill, sends it downrange at 890fps and that's 630 ft-lbs. Groups run at an inch ( 50 yards) for 4 shots, then a fill is needed.
SS