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I might undoubtedly try out them. There's not purpose that they might not do the job just wonderful with your Beeman. I have experienced fantastic luck with RWS pellets in all of my airguns (Hatsan, Crossman, Benjamin and so forth.). I'd try a tin and see how your Grizzly likes them as all guns seem to have their most loved pellets.Umarex 12 Gram C