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I would certainly test them. You can find not reason that they would not work just fine inside your Beeman. I have had 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 is cleans