I have been using the Magnus SG head for many years. It's the only small game head I use. I have shot it directly into the trunks of oak and hickory trees with no adverse effects to point or arrow shafts (hickory). They usually bounce off or barely cling by the tip of the bleeder and are easily removed.
I was beginning to panic because following Magnus selling their glue-ons to Thundervalley, I was unable to locate these heads for over a year. A month or so ago I found they were making them again and bought another dozen. Whew, what a relief.