NOT KNOWN FACTUAL STATEMENTS ABOUT SUPER177

I would absolutely check out them. There is certainly not reason that they might not operate just good as part of your Beeman. I have had good luck with RWS pellets in all of my airguns (Hatsan, Crossman, Benjamin and so forth.). I'd personally try a tin and see how your Grizzly likes them as all guns seem to have their favored pellets.The RWS Supe