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I'd personally surely try out them. There exists not reason that they'd not operate just fine inside your Beeman. I have had great luck with RWS pellets in all of my airguns (Hatsan, Crossman, Benjamin and so on.). I would test a tin and see how your Grizzly likes them as all guns appear to have their favored pellets.Umarex 12 Gram CO2 is clean up