Those heads are an excelent choice for elk or any other animal for that matter. One thing you have to remember is that that 1" cut is using 4 blades instead of two or three. If you actually sit down to figure it out you will probably actually have more tissue cut than a three blade head of 1 3/16" cutting diameter and you would need a 2" cutting diameter head if only using two blades to get the same ammount of cutting surface.

You won' t have any problems in taking an elk with your heads. They should penetrate well for you and do a lot of damage on their way through.