NOT KNOWN DETAILS ABOUT SUPER177

I'd unquestionably attempt them. There's not purpose that they would not work just fine in the Beeman. I have experienced fantastic luck with RWS pellets in all of my airguns (Hatsan, Crossman, Benjamin and many others.). I might attempt a tin and find out how your Grizzly likes them as all guns seem to have their most loved pellets.Umarex 12 Gram