I've had poor penetration with Muzzy heads when hitting the shoulder. So now you've heard a report of poor Muzzy penetration! I'm not knocking Muzzy, I don't think any head is going to penetrate a shoulder bone reliably. I am a Rage user and a very happy one at that. As much as I love the results I've seen with the 2 blade Rage, I would not expect it to perform well on a shoulder shot. Nor would I expect good results with a Muzzy, or any other head for that matter.