SUPER177 NO FURTHER A MYSTERY

I'd personally surely attempt them. There is not reason that they would not do the job just high-quality within your Beeman. I have experienced superior luck with RWS pellets in all of my airguns (Hatsan, Crossman, Benjamin and so forth.). I'd try out a tin and see how your Grizzly likes them as all guns appear to have their beloved pellets.Get Fre