Shane, I'm sure you know this - but a drop of oil (e.g. left over factory oil or olive) behind the pellet raises pressure enough to make the rifle go supersonic(diesel).
Of course this affects accuracy - Some people people think that "dieseling" is unsafe/bad for the rifle.
Google the HW-35 Barakuda. There were Spring guns designed with an ether injection system to purposely harness combustion to kick a pellet out much faster. "Harness" apparently is a generous term because it was hell on standard pellets and seals.
Enjoying reading the journey Montana Marine! I'd hung up the Springers for a while in favor of PCP's and now old skool multi-pumpers (Sheridan). I'm inspired to drag out the ole FWB-124's and R-7. The R-7 was an incredible vermin machine!
