I took the shoulder blade out of the ELk that I shot this year and shot at it post mortem, with a 160 grain griz with 125 grain adapter and a 110 grqin insert (high FOC). I love these heads more than any other I have shot, but don't recommend intentionally shooting into the shoulder bone. My BH bent about 20 degrees at the tip and the ferrule broke a chunk out which separated the BH with the rest of the arrow. I will still use them, almost exclusively, as they penetrate deep ( I had a full passs through on the Elk through the rib cage) but will respect that area of the Elk in the future!