Charlie,
An odd thing that occures with shot size and choke. If you shoot buckshot through a cylinder bore it will not open up and will pattern like a slug, but if you shoot small shot like #8 through a cylinder bore it will throw an open pattern. Now take the same loads and run them through a full choke and buckshot will be an open pattern and small shot will shoot much tighter. I think you have solved your problem and if you shoot much larger shot you will have a more open pattern.
Harry
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