I used to race bikes in my earlier years, and we had to jet the carbs to suit the weather. Seeing as cooler and overcast days would present denser (more dense) air than sunny days, we would have to richen the mixture up accordingly.
Do you think the same would apply to springers? I mean a denser air would surely increase fps? The same as shooting at sea level as opposed to JHB?
Any thoughts on this?