I'd personally definitely try them. There exists not motive that they'd not operate just wonderful with your Beeman. I have had very good 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 https://super17790099.goabroadblog.com/35002076/details-fiction-and-super177