In my case, I can account for myself quite well 'most of the time', but I struggle on the highest incoming birds, not through any deficiency in gun, choke or cartridge, but because I find it quite hard to give sufficient swing/lead. A crosser at the same height - and I'm in with a good chance, but a straight incomer frequently defeats me. I suspect part of the problem is a rather stiff back from a combination of years and 'mistreatment' (e.g. poor lifting technique of heavy items etc by me) over many years. The trick is to take it very early, but as we all know, its easier said than done!