If you need a big conical that will shoot out of your Omega and work on elk I would suggest getting a box of 460 grain .503 diameter No Excuses conicals. I shoot them out of my Black Diamond XR with excellent results. I think they would have some real stopping power to them. Also start them with about 85 grains of T-7 or Goex FFFg and the accuracy is excellent.
No Excuses Conicals can be found at this site....