Hi I have several guns, walther PCP, a Gamo under leaver, a Weirauch break barely, and My SMK th78d I like the SMK for its weight and smooth bolt action and plus CO2 cartridges are easy to carry around But....after a few Shots say about 30 I'm thinking the power drops away so need to drop in another two cartridges, but I cannot unscrew the cartrage end cap it just has too much pressure behind it to unscrew so I have to spend ages firing off the remaining CO2 to allow the pressure to drop enough to be able to turn it with my fingers,
Where am I going wrong, what is the answer, I'm I mista
