I think the ballistics data you are quoting is for the .30 Carbine fired in a rifle- or carbine-length barrel, not a revolver. My Speer #12 manual (handgun section) indicates the highest velocities they got from a Ruger Blackhawk in this caliber was a 100 grain bullet (round nose Speer Plinker) at 1589 feet per second, and the 110 grain Varminter at just over 1400 FPS. These loads would yield 568 ft/lbs and 478 ft/lbs of energy, respectively, putting them in a virtual tie with several popular .357 Magnum loads (which were tested in a shorter barrel). Same energy as a .357, but using a lighter and smaller-diameter bullet? Great for coyotes, raccoons, and other smaller varmints, but not a good choice for deer, in my opinion.