I might certainly check out them. There is not motive that they'd not work just fine with your Beeman. I've had 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 https://super17767666.imblogs.net/85600402/the-5-second-trick-for-super177