I believe when 5shot tested these heads he found that the blades had a bad tendecy of coming off when shot into anything substantial. I don't know if Rocket has done anything since to rectify the problem.

I know someone that tried them and I wasn't impressed at all with them. To small of a profile and it doesn't look like it would do very much tissue damage(wound channel). I think for dangerous game or Moose you would be better served by a stronger 2 or 3 blade that was cut on contact. Magnus, Phantom, Steelforce and G5-Monotec would probably be better choices.