Well, if you're going for elk, and using 53#, you really should look into a cut on contact head, and stay away from replaceable blade heads.The Magnus Stinger is a great choice.Some others are STOS, Eclipse,Zwickey Eskimos,and Grizzly's.And learn how to sharpen them.Grizzly's are the hardest to learn to sharpen, but they are a dang good head if you can.
Since you're looking at Magnus, I'd lean towards the Stingers,either 2 blade or with bleeders.