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I'd certainly try them. There is certainly not explanation that they might not do the job just great in your Beeman. I have had very good luck with RWS pellets in all of my airguns (Hatsan, Crossman, Benjamin and so on.). I would attempt a tin and see how your Grizzly likes them as all guns appear to have their favorite pellets.Umarex 12 Gram CO2 i