RUMORED BUZZ ON SUPER177

I'd personally unquestionably try them. There's not purpose that they would not do the job just fine inside your Beeman. I have had excellent luck with RWS pellets in all of my airguns (Hatsan, Crossman, Benjamin and many others.). I'd personally attempt a tin and find out how your Grizzly likes them as all guns appear to have their favored pellets