Here is an elk that I shot this year. It was a twenty yard shot with my Mathews SQ2 pulling around 67 pounds. I use an alum. Easton arrow tipped with a Muzzy 3 blade 100 grain broadhead.
And the next one is my buddies cow that he shot with the same bow (not my bow, we have the same), aluminum arrows also, but he tips his with thunderheads.
My Dad has also shot a hand full of elk with his Mathews pulling closer to 64 pounds. He always used those cabelas broadheads. Laser Mags I think they are called.