Ok a few newbe questions I recently brought a S/h HW100 with an FX cylinder and MTC Viper 10x44 scope. I've joined a local club (Dowry Hill) and had a go at bench rest shooting at 25yds and am quite taken with it. So to my questions: My scope is perhaps not up to the job and I'd like to upgrade to something like a 10-30X56 but I'm not liking the prices, even for the middle of the road makes, been on the lookout for a 2nd hand example, but they are thin on the ground so can anyone offer any advice on whats any good at the cheaper end. Or would I be wasting my money? Next question: Up to now I've filled my cylinder while its attached to the gun, if I unscrew the cylinder does it let out the remaining air or can I detach it to refill.?