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I would certainly check out them. There is not motive that they might not get the job done just great in the Beeman. I've had very good 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 seem to have their favorite pellets.Umarex 12 Gram CO2 is cle