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I would certainly try out them. There exists not rationale that they would not get the job done just good in your Beeman. I have had great luck with RWS pellets in all of my airguns (Hatsan, Crossman, Benjamin and so on.). I'd try out a tin and see how your Grizzly likes them as all guns seem to have their preferred pellets.Umarex twelve Gram CO2 i