Originally Posted by Jimski
temperature, humidity, I bet these are going to affect compressed gas behavior.
...that could affect tightbore barrels too.
store your guns in some other (warm and with constant humidity) room one day, make measurements and do the same thing a few days later - compare ?
Well, I doubt either of those would have much of an effect. My basement doesn't really change much form night to night, maybe a few degrees at the most. And it's my AEGs and M24 (spring) that are affected, not my springer (which is the odd part). This is obviously not a simple issue, it has to be even more complex than I can even figure out at this point (I'm no rocket scientist, but all I can even think how slight changes in humidity and temp can alter the fps that much without any other changes is the compressability factor).