NOT KNOWN FACTUAL STATEMENTS ABOUT SUPER177

I might certainly check out them. There exists not reason that they'd not do the job just good with your Beeman. I've experienced great luck with RWS pellets in all of my airguns (Hatsan, Crossman, Benjamin and many others.). I'd personally try a tin and find out how your Grizzly likes them as all guns seem to have their preferred pellets.Umarex 12