Gunner,
I've had the pleasure of shooting a Merkel .500NE, helped a good bud reload for one. Never touched off a .505 Gibbs. Agree with the .500 being good 'diller medicine. Gibbs could be overkill, if there is such a thing. Dead is dead regardless how it happened.
DF
Gunner might as well just run them down with his pick up. Probably about the same ft lbs of force but easier on the shoulder