FPS from 12lb spring?

[Badgerboy]

Best fifty quid I ever spent was on a combro. The only thing here is and I am sure Talon will already know this is that a rifle giving nine foot pounds at the muzzle will still drop airgun quarry at thirty yards if you can hit the kill spot. Best advice don't get hung up on power stick with accuracy and keep a spare spring and power bands for lf TSHTF because it won't matter if your gun is pushing twelve or thirty.