NOT KNOWN FACTUAL STATEMENTS ABOUT SUPER177

I would definitely attempt them. There is certainly not motive that they'd not work just fine as part of your Beeman. I have experienced superior luck with RWS pellets in all of my airguns (Hatsan, Crossman, Benjamin etc.). I might attempt a tin and see how your Grizzly likes them as all guns appear to have their most loved pellets.Good quality amm