NOT KNOWN FACTUAL STATEMENTS ABOUT SUPER177

I'd personally definitely try them. There is certainly not purpose that they might not do the job just fantastic inside your Beeman. I've had good luck with RWS pellets in all of my airguns (Hatsan, Crossman, Benjamin and many others.). I might attempt a tin and find out how your Grizzly likes them as all guns seem to have their favorite pellets.So