Lloyd: I'm sorry if I missed it, but I reviewed the entire thread and don't see the wall thickness numbers from end-of-chamber out to 9", which IMHO are critical
Today's powders, applicable for standard and light loads have, in general, a rapid rise and fall in pressure.
This is from the Alliant site, for 1 1/8 oz. 3 Dr. Eq., and pressures at 9" are less than 2000 psi

[Linked Image from photos.smugmug.com]

We fortunately now have a good collection of what are felt to be original wall thickness numbers, which could at least establish that your barrel numbers are similar. That, to me, would be reassuring.

Get well brother.