NOT KNOWN DETAILS ABOUT SUPER177

I'd certainly test them. There may be not cause that they'd not work just high-quality in the Beeman. I've experienced great luck with RWS pellets in all of my airguns (Hatsan, Crossman, Benjamin and so on.). I might try a tin and see how your Grizzly likes them as all guns seem to have their favorite pellets.Get FREE shipping on qualifying orders!