THE 2-MINUTE RULE FOR SUPER177

I'd certainly try out them. There may be not explanation that they would not function just fine as part of your Beeman. I have had great luck with RWS pellets in all of my airguns (Hatsan, Crossman, Benjamin and so forth.). I'd personally check out a tin and see how your Grizzly likes them as all guns appear to have their beloved pellets.Umarex 12