Balloon testing !!
Return to airguns

The idea  is to see how efficient each gun really is

Method
crono each gun - 5 shots get an average power in feet lbs
Shoot (empty ) gun into balloon and measure the volume of air used / shot

I ordered a measuring cylinder from ebay to more accurately measure the volume - previous tests carried out using a jug - good for a finger in the air view but not perfect

the cylinder image

The results

The 850 Magnum 790 FPS - 8.4 grain pellet =  11.644 Feet pounds - 250 ml / shot
The C State 795 FPS - 8.4 grain pellet = 11.72 Feet pounds  - 190 ml / shot
AT44 787 FPS 8.4 grain pellet = 11.55 Feet pounds  -220 ml / shot

the Desmond gun (.22)  607 FPS 14.3 grain pellet 11.72 feet pounds   - 120 ml / shot

interesting how much more efficient the .22 is compared to a 177 giving similar power ...