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I'd undoubtedly try out them. There is not purpose that they would not function just good within your Beeman. I have experienced excellent 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 most loved pellets.Umarex 12 Gram CO2