NOT KNOWN DETAILS ABOUT SUPER177

I would definitely attempt them. There is certainly not motive that they might not get the job done just great with your Beeman. I have had good luck with RWS pellets in all of my airguns (Hatsan, Crossman, Benjamin etc.). I'd test a tin and find out how your Grizzly likes them as all guns seem to have their most loved pellets.High quality ammo, I