I might absolutely try them. You can find not cause that they would not work just great in your Beeman. I have experienced excellent luck with RWS pellets in all of my airguns (Hatsan, Crossman, Benjamin etc.). I might try out a tin and find out how your Grizzly likes https://super17766655.ttblogs.com/15704477/super177-can-be-fun-for-anyone