Firstly, this is new for me, both posting and Air Guns. I have obtained a Benjamin 3030 Repeater for varmints. I have been unable to obbtain a schematic of it! I used the right air cartridge,ie, 8 grams. After one shot the CO2 cartridge fully discharges. Bolt, holder, and cartridge becomes cold from discharging of the gas and it will not shoot another round (BB). Any ideas?