The weight of pellets isnt the only factor affecting velocity. How tight or loose they fit makes more difference unless they arent lead. Performance isnt necessarily just velocity, accuracy is most important as far as Im concerned.
True ! My Sig ASP20 with the Crosman 14.3 gr do 825 fps. They fit loose. Snugger fitting JSB pellets at 14.7 get me up to 840 fps. Same applies to both my RWS 34's. Loose pellets start moving down the barrel before peak pressure is achieved upon firing.
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