only thing i can think of that could make a difference is there is a cross wind
airgun pellets tend to climb (or slow dropping) in a right to left wind (assuming pellet is spun clockwise as you look at it from behind)
and fall in a left to right wind its fairly minimal and maybe only on pellets at longer ranges
airgun pellets tend to climb (or slow dropping) in a right to left wind (assuming pellet is spun clockwise as you look at it from behind)
and fall in a left to right wind its fairly minimal and maybe only on pellets at longer ranges