Fedex finally got my .25 pellets here today so I had achance to run a few across the chrony with some interesting results:JSB Exact King Diabolo 25.39 grain was a high of 701fps and a low of 689fps,generally hovering around 699-700fps range.Gamo Rockets at 20.8 grain was a high of 787fps and a low of 747fps, generallyhovering around 760-770 range.H&N Field Target Trophy at 19.91 grain was a high of 800fps and a low of 775fpshovering around 785-795 range.The .25 barrel that I installed from Mike Melick has no sound suppressor at all so the gun isdefinitely not as back yard friendly as the stock .22 Octane, so my shots were limited. Will do someadditional shooting tomorrow weather permitting. Chrony measurements were at themuzzel and I did not try to shoot for accuracy at this time. All in all I ampretty pleased with what I see so far, and .25 pellets seem like cannon ballscompared to .22 cal... :-)