Yep! As MOCraig stated I also had a failure with a Muzzy. It was a 100 gr 3-blade on a 30" 2315. If I remember correctly it was a mid-sized 6 pt, I was about 15' up and was shooting at him broadside from about 12-15 yds. You could tell by looking at the ferrule that it didn' t penetrate past the back of the blades. Only one blade remained and the ferrule was broke and bent over at about a 40 degree angle. I too probably hit a sholder but like Craig said, I still would expect more penetration then that. The arrow weighed about 575gr and was at about 260 fps, so the KE wasn' t lacking. All in all, I still think the Muzzy' s are one of the better fixed blade heads and this may or may not have been my fault or a fluke all together.

Toby