This should be something that testing could clear up. I have a Pressure Trace we can use (straingage), I enviison we'd need a couple barrels screwed together and the ultimate port job might help reduce most of the hoop strain from gas pressure and provide some contrast in the strain values. Straingage two areas: one at the choke cone, the other along the straight bore. Just need a pump, single, or auto with two plain barrels we can wreck.