I might definitely try them. There's not purpose that they would not work just great in your Beeman. I've experienced great luck with RWS pellets in all of my airguns (Hatsan, Crossman, Benjamin etcetera.). I would try a tin and find out how your Grizzly likes them as all guns https://super17756666.mybloglicious.com/56078472/super177-things-to-know-before-you-buy