Got the fire extinguisher and went on filling the paintball bottles, but I have a small problem here. The bottles are 12oz ones and the extinguisher is 2kg - I only managed to fill the bottles to 10oz and 9.5oz. Before I filled the bottles I put them in the freezer as I had read somewhere that it should help, but still didn't manage to get 12oz. Is it anything to do with the extinguisher, maybe its too small at 2kg?