NOT KNOWN DETAILS ABOUT SUPER177

I might certainly try them. There's not explanation that they would not get the job done just great inside your Beeman. I have experienced great luck with RWS pellets in all of my airguns (Hatsan, Crossman, Benjamin etcetera.). I might check out a tin and find out how your Grizzly likes them as all guns appear to have their favourite pellets.Good q