You can compare the muzzle energy here as well by clicking on various brands...
http://www.midwayusa.com/find?sortby...ensionid=15597
The web sites of each manufacturer also display such info.
This particular test may also be helpful...
http://ammo.ar15.com/project/Self_De...BW_5_27_09.pdf
The energy figures are only one factor to look at in thinking of a round.
tipoc