Personally I wonder if RB's don't get puched a little too fast also. I shot a deer in the neck up close with a 50, loaded with 90 grs. 3f. The deer bounced when it went down but I never saw an exit hole. Never found the ball either. RB's do decelerate very rapidly. There used to be a theory that the gains over 1800 fps muzzle velocity were really not worth it down range. The English used to used moderate powder charges behind large bores which worked well for them. An individual I built a rifle for killed an 8 point buck with his 62 RB and 70 grains of powder. He was close but the deer didn't go that far either. A .600 ball still blows a pretty big hole.
Northmn