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I'd undoubtedly consider them. There may be not rationale that they would not operate just good as part of your Beeman. I've had great luck with RWS pellets in all of my airguns (Hatsan, Crossman, Benjamin and so forth.). I'd consider a tin and see how your Grizzly likes them as all guns seem to have their preferred pellets.Umarex twelve Gram CO2 i