NOT KNOWN DETAILS ABOUT SUPER177

I might surely check out them. There exists not explanation that they'd not operate just high-quality as part of your Beeman. I've had superior luck with RWS pellets in all of my airguns (Hatsan, Crossman, Benjamin etc.). I'd personally check out a tin and find out how your Grizzly likes them as all guns seem to have their favourite pellets.The RWS