NOT KNOWN DETAILS ABOUT SUPER177

I'd unquestionably attempt them. There exists not rationale that they might not work just fine inside your Beeman. I have experienced good luck with RWS pellets in all of my airguns (Hatsan, Crossman, Benjamin and so forth.). I'd personally attempt a tin and see how your Grizzly likes them as all guns seem to have their favored pellets.Umarex twelv