NOT KNOWN FACTUAL STATEMENTS ABOUT SUPER177

I would certainly try out them. There exists not explanation that they might not work just good inside your Beeman. I have experienced good luck with RWS pellets in all of my airguns (Hatsan, Crossman, Benjamin etc.). I'd try out a tin and see how your Grizzly likes them as all guns seem to have their most loved pellets.So look out for our products