NOT KNOWN DETAILS ABOUT SUPER177

I might surely test them. You can find not explanation that they'd not get the job done just high-quality in the Beeman. I've experienced very good luck with RWS pellets in all of my airguns (Hatsan, Crossman, Benjamin etc.). I would check out a tin and find out how your Grizzly likes them as all guns appear to have their favored pellets.Umarex 12