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...most sporting targets are best shot with a IC or M choke, so why NOT have fixed chokes - less worry about blow-by, no need to figure out chokes in .005 increments....instead you focus on the target.....if you're on the bird, you're on the bird......
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You are over simplifying things here greatly. This all depends on the individual course that you are shooting at. I mainly shoot sporting clays with LM, which is a choke I've never even seen offered in a fixed choke shotgun. We typically do have a couple of real close targets, and a couple of distant ones too. Although our local operator is constantly changing the course. In any event, I only change chokes for those stations that are at the extremes.
If a person is so weak-minded that changing a choke tube between stations is going to ruin their concentration while on the course, well, then they have much bigger problems affecting their shooting that they clearly need to address.
Changing shot size has no significant effect on your pattern. 7 1/2 is more effective at longer ranges because the pellets retain more energy at those ranges than 8's do. 8's are not as reliable in breaking birds at long range.
That is the reason for varying your shot size.
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