I would certainly attempt them. There is certainly not cause that they would not function just good as part of your Beeman. I've had excellent luck with RWS pellets in all of my airguns (Hatsan, Crossman, Benjamin and so on.). I'd attempt a tin and find out how your Grizzly https://spencerjylxh.elbloglibre.com/35995456/super177-can-be-fun-for-anyone