SUPER177 FOR DUMMIES

I'd personally definitely attempt them. There is certainly not explanation that they'd not operate just fine inside your Beeman. I have had good luck with RWS pellets in all of my airguns (Hatsan, Crossman, Benjamin etc.). I'd personally try a tin and see how your Grizzly likes them as all guns seem to have their preferred pellets.The RWS Superdome