Lloyd Sikes at the AirGunLab has broken 2000 fps in his first attempt.... The barrel is a .278 cal smoothbore (piece of DOM tubing), 47.5" long, powered by a 55 cc reservoir with a unique pellet release mechanism that allows full pressure against the pellet before firing.... The 9.1 gr. pellet was made from aluminum, sealed into the bore with an O-ring, and this test was done at 4000 psi....

https://www.youtube.com/watch?v=JWt5...layer_embedded

This permanently puts to rest the idea that 1650 fps (the molecular velocity of air) is the limit for a PCP.... Congratulation, Lloyd, on a job well done....

Bob