Bullet Energy numbers do not amount to much, they are a marketing ploy.
The bullet momentum is the more important figure.
The laws of physics tells me if my bullet is leaving the muzzle with 5000 ft pounds of energy then my shoulder will receive 5000 ft pounds of energy.
The idea of shooting hvy for caliber bullet is a sound one for the momentum of the bullet do the job.
If you shoot a 125 pound prong horn with 5000 ft pounds of energy then by all rights he should be blown off his feet and out several yards.
Energy numbers are not a bad way to judge one cartridge against another but in the field it is another matter.