SUPER177 NO FURTHER A MYSTERY

I might definitely test them. There's not explanation that they'd not do the job just great within your Beeman. I have experienced superior luck with RWS pellets in all of my airguns (Hatsan, Crossman, Benjamin and so forth.). I would try a tin and find out how your Grizzly likes them as all guns seem to have their favorite pellets.Umarex 12 Gram C