At the Fred Bear shoot a couple weeks ago, my buddy and I were egging each other on at the steel challenge targets (the stell plates with holes cut out for the vitals). I was shooting Snuffers, and he was shooting Magnus'. Out of the 3 targets, I hit one, and ruined the broadhead. He hit the first 2, with the same head, and each time it was stuck in the steel plate. We needed pliers to pull the head free. Each time the glue joint would fail, and the arrow would come free of the head, to which he just heated up the glue, and put the broadhead back on. The final target was a pass thru. The only thing we noticed on the arrow was the point taper kept getting lengthened. There was no visible damage to the Magnus head at all.
I have since taken all my snuffer heads off, and replaced them with Bear Greenies. When those (21 of them) are all gone, I will buy some Magnus heads.