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Without measuring the bores, the muzzle diameters can allow you to only speculate what the constriction may be. No way of knowing for sure. Oversized bores are not at all uncommon.
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B. Dudley
The Following User Says Thank You to Brian Dudley For Your Post:
I have a 10 ga lifter circa late 1870' s and bores measure .802 and .805 chokes measure at .760. and actual patterns lead #6 at 35 yards show 90% patterns.
The Following 3 Users Say Thank You to George Lang For Your Post: