I'd absolutely attempt them. There is certainly not explanation that they might not do the job just wonderful within your Beeman. I've experienced very good luck with RWS pellets in all of my airguns (Hatsan, Crossman, Benjamin and many others.). I might consider a tin and see how your Grizzly https://andreguhsd.goabroadblog.com/35007087/how-super177-can-save-you-time-stress-and-money