NOT KNOWN DETAILS ABOUT SUPER177

I'd absolutely test them. You can find not cause that they'd not perform just fantastic with your Beeman. I have had great luck with RWS pellets in all of my airguns (Hatsan, Crossman, Benjamin and many others.). I might consider a tin and see how your Grizzly likes them as all guns seem to have their preferred pellets.Umarex 12 Gram CO2 is cleanse