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Finally, I should mention that .410 ammo selection is important. There are huge differences in pattern characteristics among available factory 3" loads.
Sam
Sam,
Thanks for your input! You helped validate my .410 experiences. As far as ammo goes, I'd imagine that shot hardness would be a major contibuter to good patterns. I was looking at some advertising for some of the latest "environmentally friendly" shot and found one (the name I forget) which was quite heavy and nearly as hard as steel. I imagine using that shot in a .410 would give excellent patterns. I'm thinking just using bismuth shot would help (of course now we'd really have over-priced ammo!).
Steve