I would undoubtedly try out them. There is certainly not explanation that they'd not operate just high-quality inside your Beeman. I have had good luck with RWS pellets in all of my airguns (Hatsan, Crossman, Benjamin and so forth.). I'd test a tin and find out how your Grizzly likes https://marcotmdsd.snack-blog.com/36002235/the-smart-trick-of-super177-that-no-one-is-discussing