I would surely check out them. There is certainly not purpose that they might not perform just wonderful with your Beeman. I've had superior luck with RWS pellets in all of my airguns (Hatsan, Crossman, Benjamin etcetera.). I'd attempt a tin and find out how your Grizzly likes them as https://jp500-rtp70245.blog-ezine.com/36159818/how-super177-can-save-you-time-stress-and-money