NOT KNOWN DETAILS ABOUT SUPER177

I might surely check out them. There is not reason that they'd not operate just wonderful as part of your Beeman. I've had excellent luck with RWS pellets in all of my airguns (Hatsan, Crossman, Benjamin and so forth.). I'd test a tin and find out how your Grizzly likes them as all guns seem to have their favourite pellets.The RWS Superdome for air