William, first one has to check barrel thickness at the muzzles before opening the chokes. I've found the American made doubles I've checked all have thick walls. English doubles are a different story. If you're going to open a gun with .035 constriction [ full choke ] to say .015 [ I/C ] you're removing .020, or .010 on a side. The guns I've done for myself all had at least .040 to .060 wall thickness, so removing .010 isn't going to hurt a thing. The Americans seem to like heavier guns, where as the English like light guns, meaning thinner barrels. But then we also like heavier loads of shot. I guess it's just our nature, bigger is better, too much is just right.
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Paul Harm
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