While foot pounds of energy might be a measure of work, the measurement does not equate to the effectiveness of a bullet on a game animal. With shots other than those to the central nervous system, death subsequently results from a lack of oxygenated blood reaching the brain causing the brain to die. The effect of the bullet on tissue is determined by the frontal area of the bullet, by the construction of the bullet, and by the momentum of the bullet created by the combination of weight and velocity. Bullet expansion with jacketed soft points becomes inconsistent at velocities below 2000 fps. The effect of a heavy wide flat nose non-expanding cast .44 bullet on tissue at velocities between 1200 and 1800 fps will certainly be the equal and in some circumstances exceed the wound cavity produced by a .30 caliber bullet of half the weight and a velocity of 2000 fps. Should that .30 caliber round nosed bullet fail to expand, or expand and fail to penetrate, it will take longer for the game animal to succumb to the wound. The velocity possible with the .30/30 gives it an advantage of range over the .44 by perhaps 50 yard. But when both cartridges are used within their range limitations, it is unlikely that much of a case could be made in favor of one over the other, except that I can carry my .44 on my belt.