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I'd personally undoubtedly test them. There may be not reason that they would not do the job just fine with your Beeman. I've experienced great luck with RWS pellets in all of my airguns (Hatsan, Crossman, Benjamin etcetera.). I might try a tin and see how your Grizzly likes them as all guns appear to have their beloved pellets.Umarex 12 Gram CO2 i