I know this is an air gun but I didn't see a category for them. Anyways, I have a Crosman American Classic that I've shot rather extensively (over 2,500 pellets). I've noticed recently that at longer( 50-75 yards), the gun is starting to shoot lower than usual. I haven't changed pellets and I'm 99% sure that nothing has happened to the sights. What gives? All I can really think of is that the air reservoir is leaking or has lost capacity. Does anybody have any ideas?