SUPER177 NO FURTHER A MYSTERY

I'd personally absolutely test them. You can find not rationale that they might not do the job just fine in your Beeman. I have had excellent luck with RWS pellets in all of my airguns (Hatsan, Crossman, Benjamin and so on.). I'd attempt a tin and see how your Grizzly likes them as all guns appear to have their preferred pellets.Top quality ammo, I