The 3" long chokes are hard to explain. Of course I don't know where Bob measured bore diameters but the ones he posted look to me to be original. Could the barrels be jug choked? What is the diameter of the bore 3-1/2" from the muzzle?
Minimum wall thickness for me means wherever it occurs. While a barrel with .020" MWT 6" from muzzle may not burst when shot if it gets dented there I have been told that there may not be enough metal left to do a proper repair. Frequently I find thin spots where dents have been repaired, usually on the muzzle half of the barrel. Anyway I check the wall thicknesses for the entire barrel length. I also check chamber wall thicknesses at the muzzle end of the chambers.
Minimum wall thickness is not just about safely holding pressure but also about repairablity in the event of a dent.
Best,
Mike
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