I'd personally definitely consider them. There is not reason that they would not work just high-quality with your Beeman. I have had great luck with RWS pellets in all of my airguns (Hatsan, Crossman, Benjamin and so on.). I would test a tin and see how your Grizzly likes them https://super17724456.ttblogs.com/15711983/not-known-details-about-super177