NOT KNOWN DETAILS ABOUT SUPER177

I might undoubtedly test them. There may be not rationale that they might not do the job just great in your Beeman. I have had great luck with RWS pellets in all of my airguns (Hatsan, Crossman, Benjamin and so on.). I'd attempt a tin and see how your Grizzly likes them as all guns seem to have their favourite pellets.Good quality ammo, I under no