regardless of the energy using a hollow point out of a 41 for elk would be unethical, you will not get the penetration needed, in fact you would be lucky to reach one lung. I cannot overstate enough how different from a deer these animals are, their skeleton is massive compared to a deer and unless you thread it between the ribs and don't hit any other bones your in trouble which is why I stated before that if you must use a 41 then use the heavy hardcast. I think I mentioned before that the bull I shot this year I hit the final time at about 60yds with a 45-70 running a 350gr Hornady soft point at 1900fps and it went through one rib the heart a second rib but was stopped by the leg bone and that is alot more energy and penetration than you'll ever get out of a 41.