I'd undoubtedly check out them. There is not reason that they would not work just fine in your Beeman. I've had great luck with RWS pellets in all of my airguns (Hatsan, Crossman, Benjamin and many others.). I would test a tin and see how your Grizzly likes them as https://super17722211.mybloglicious.com/56088276/details-fiction-and-super177