I would certainly try out them. There may be not purpose that they'd not operate just high-quality in your Beeman. I've experienced good 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 12 Gram CO2 is clea