Ok. Just a point of clarification, since you said it twice. The above from BBTI is NOT energy, it is VELOCITY in fps.
Another point of reference, the .44 mag 240gr hydra shock load clocked in at 1,296 fps from a 6.5" model 629 and only 1,094 fps from a 4" model 629. These are velocities, not energy. The point is magnum revolver cartridges apparently lose A LOT when stepping down to a 4" barrel. It dropped off 202 fps, which is a bunch.
I own several magnum revolvers and only one 10mm, so I don't think it is bias on my part.
I have seen 4" revolvers chrono faster than 6" revolvers on the same day with the same ammo. I have also seen them chrono nearly the same speed, it all depends on the ammo and the individual revolvers being used.
The Hydro Shock loads by Federal have never been much over 1200 FPS loads and are not top end 44 mag loads.
Check this link
http://www.ballistics101.com/44_magnum.php
