Deciphering barrel thickness

[Rick Riddell]

So the confusion was with the form I got online, I spoke with Mr. Fey, the .170 -.076 is the span of the forcing cone which is about 10 inches, so .170 at the start and .076 at the end. the left was 7 inches respectively. So somewhere between the original owner, the work that Parker did and the gentleman who inherited the gun, the right cone was lengthen. If I keep it at low pressure loads it should be fine, if that makes sense

[edgarspencer]

Originally Posted by Rick Riddell

So somewhere between the original owner, the work that Parker did and the gentleman who inherited the gun, the right cone was lengthen. If I keep it at low pressure loads it should be fine, if that makes sense

Another possibility is that the right barrel had some honing done to remove pitting in front of the forcing cone.
Don't quite understand the figure for the left barrel "Minimum wall Thickness"