NOT KNOWN DETAILS ABOUT SUPER177

I'd undoubtedly consider them. There may be not cause that they would not perform just fantastic with your Beeman. I have had great luck with RWS pellets in all of my airguns (Hatsan, Crossman, Benjamin etcetera.). I'd personally test a tin and find out how your Grizzly likes them as all guns seem to have their favourite pellets.Umarex twelve Gram