Drew,

I will be very interested to find out what you see via x-ray.

I had x-ray and magna-flux work done on a handful of barrel sets 20-25 yrs ago. My own experience was that neither process was definitive. A couple of tubes had pitting and I would have thought that something besides just the puts would have shown on those, but no. Advances have been made in x-ray technology, and hopefully you will gain more insight today.