My bet is that the OP is filling with gas, not liquid CO2.... You should get more shots by bulk filling.... I had a 114 once, and IIRC I drilled through the brass CO2 fill fitting and threaded it for a male Foster.... then bulk filled from a 20 oz. CO2 cylinder through a standard ASA fitting with female Foster.... I had to invert the tank to fill the gun....If you warm the supply tank and chill the gun, you have a chance of overfilling the gun with CO2.... That can be VERY dangerous, because when the gun warms up the pressure can skyrocket.... high enough to blow a 3K burst disc on a CO2 tank that is overfilled.... …. CO2 should always be filled by WEIGHT, not by volume.... The correct weigh of CO2 for a 100% fill is 7/18 oz. per CI.... which works out to 2/3 gram per cc.... For each 30 cc of tube volume, that means 20 grams of CO2.... Bob