I'd undoubtedly consider them. There may be not purpose that they would not function just fantastic within your Beeman. I have experienced superior luck with RWS pellets in all of my airguns (Hatsan, Crossman, Benjamin etc.). I would try a tin and find out how your Grizzly likes them as https://super17722110.bloggactif.com/37354042/rumored-buzz-on-super177