Sporting a 14" Polygonal choked LW .25 barrel and a upgraded 858cc bottle it pushes .25 JSB 25.4 grain pellets in the low 900s for around 50 shots. Then I unscrew my 858cc tank and swap out a stock 490cc velocity matched tank for another 30 shots so I don't have to go back to the truck for more air. Accuracy is pretty decent as well.
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.25s are big but here is a 25 yard 5 shot group I always get one a little off. 
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Randy