ContinentalOp
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Remember reading (years ago); but IIRC, some folks who had 'slugged" their barrels..... said the bore of the Python had a slight "tightening"/narrowing from the cylinder to the bore.... which some claimed added to their accuracy.........
I've heard the same thing. My understanding is that this was at least one of the reasons why it was popular to install Python barrels on Smiths.