The energy you feel in the recoil of the gun shooting the bullet, is the same amount of energy from the bullet. At handgun velocity the 'stopping power' is determined by the amount of tissue destroyed by the path of the bullet. So shot placement, bullet construction, and number of rounds placed into the target have much more effect than energy. As a hunter I have found two holes better than one in how far a deer travels before falling. I prefer an in and out. Handgun rounds and what damage they do is like comparing a Honda accord going 40 mph vs a ford focus going 45 mph and arguing how much more damage they do compared to the 'rifle round' of a corvette travelling at 110 mph or a 'shotgun' 18 wheeler travelling at 50 mph.