I would chuck Chucks tables out the window!!!! First recoil velosity is very relavant! Energy is figured by this simple formula Velosity X Velosity X weight in grains divided by 450240. You also figure in weight of powder charge and some other stuff depending on if you have to determine the velosity on your own. In any case, rifles of equal weight, the .300 Ultra mag kicks alot harder then the Weatherby and if you look at those velosities only a masochist would opt for the Ultra.