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I'd certainly consider them. There may be not rationale that they'd not get the job done just fine in your Beeman. I have had good luck with RWS pellets in all of my airguns (Hatsan, Crossman, Benjamin and so on.). I might test a tin and find out how your Grizzly likes them as all guns appear to have their preferred pellets.Umarex twelve Gram CO2 i