I might undoubtedly try them. You can find not motive that they would not work just great in your Beeman. I've had fantastic luck with RWS pellets in all of my airguns (Hatsan, Crossman, Benjamin and many others.). I'd check out a tin and find out how your Grizzly likes them as all guns seem to have their most loved pellets.Umarex twelve Gram CO2 i