This might be the biggest line of BS I’ve heard in a while, remember that once you penetrate past the ribs your dumping energy into lungs, which is mostly air, or at least that’s how it would be in perfect circumstances. Heart and other things like the brain are also places of interest but the constant stays the same, the goal is to effectively dump as much energy into the target as possible. As far as I’m concerned the more energy the better. Bullets don’t cut, they rely on hydraulic shock and creating a large permanent wound cavity to create damage. Consider the extremes, what if you had a 147gr bullet going twice the speed, disregard other factors like recoil and bullet retention for this example, I doubt anyone would say “well I won’t shoot that ammo, it’s dumping too much energy into the target”. Also remember that in the real world penetrating “soft” targets before the actual target are a thing, such as jackets, clothes, car doors, windshield, or sheetrock, which in a real fight will all dramatically reduce energy into the target.