Frank, I'd be willing to bet that those "swells" will have little if no effect when using plastic wads. As you well know that these plastic wads used in vintage guns designed to pattern loads with no shot protector have become a game changer in better patterns. JMO of course.
Andy, I've got a few instruments for measuring bore/choke dimensions and I've found very little concern over a few thousandths difference. I am concerned over bore diameters which are wildly over bored. Chokes, not so much. I'm always surprised on how they perform (the choke) even though they don't jive with the charts.
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Wag more- Bark less.
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