30FT/ILB .177

Dreamline .177 x2 plenums, huma air transfer port, huma slug probe, huma high power spring, aftermarket 22/25/30 hammerweight. Shooting jsb 16.2 grain at 950 70 shots per fill. 500 mm barrel. So yeah with a lot of tinkering crown should work but not stock

I believe you can get pretty close to 30ftlbs out of a .177 Crown. Especially the Gen. 2, 

It’s funny this is being brought up, good friend of mine just got a .177 barrel kit from Utah airguns we installed it and with 13.4 RD’s it was shooting well over a thousand FPS. And want add that it was purchased as a .25 and he’s never adjusted it from stock other than to put the transfer port down to .177-.22, also I believe the .177 barrel is only 500mm? Maybe 380?