I might surely test them. You can find not rationale that they might not function just good within your Beeman. I have experienced superior luck with RWS pellets in all of my airguns (Hatsan, Crossman, Benjamin etcetera.). I might try a tin and find out how your Grizzly likes them https://cruzbnyju.idblogmaker.com/35043964/the-ultimate-guide-to-super177