I've always thought the 9 pound .375H&H comes back with about 40-42 pounds, while a 9 pound .458 is around 56-58 pounds & a .460 WTBY is around 86. Considering the .577 Nitro is around 160 and the 4 bore at just over 200, I assume the .416 Ruger is somewhere in there with the 'light' kickers.