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I'd absolutely try them. There's not explanation that they'd not operate just high-quality in your Beeman. I've experienced excellent luck with RWS pellets in all of my airguns (Hatsan, Crossman, Benjamin and so forth.). I'd try out a tin and see how your Grizzly likes them as all guns seem to have their favorite pellets.Umarex 12 Gram CO2 is clean