My wife blew through both scapula and out on a year and a half buck this year with a Zwickey. It was towards the rear of the scapula, but what impressed me was that the arrow went straight through no deflecting. She has gotten unreal penetration with an original Grizzly as well. That arrow was very old and was a right winger on a left wing arrow. The entire arrow was in the deer and the head was lodged in the far opposite shoulder. What we have between Grizzlys and Zwickeys are two incredible products, that will work for anyone. I think that, for some, the Zwickey is easier to sharpen. The last deer my son shot with a Zwickey Delta, "It was just like the other one, an unreal amount of blood." These heads were all just file sharpened with just a bit of work with a diamond hone.