The subject gun I am considering purchasing has 3 bulges in the right barrel, according to seller. From the breech - 14", 15 1/2" and 17". The first two are just 'barely' noticeable acc. to seller. The 17" is more pronounced.
When I read this last addition to the thread my first thoughts were the wave pressures Drew Mentioned from Burrard. However in Burrard's notation each bulge was smaller as it got further down the barrel. In this case the l farthest (17") is the larger so it seems doubtful these all occurred with just one shot. I would doubt there is enough difference in wall thickness from 14" to 17" to allow a greater bulge at 17" with a lower pressure than at 14".
