DB1:

Excellent post and consider the axe buried the hole covered well.

The tests planned will start with single barrels guns {two bigbore NE calibers}. Barrels are ordered. I have been told the strain gauges will be attached at 6-inch intervals but might be set up at different intervals.

As for photographing OSR, the use of a digital may make it somewhat easier. Give this a try; in a dead black room {closet, etc}, shine a strong spot light as from a powerful, focussed flashlight on the barrel from the side. Take a series of pictures looking up the long axis of the barrel at 90 degrees to the direction of the light source from breech or from the muzzle, or both, using no flash, but do use the exposure compensation starting at -2 and shoot a shot at each increment to +2. Maybe see what you get. Maybe use your dusting approach in concert with the lighting scheme I suggest, along with advances in exp comp. What we are trying for is a shadow effect, however small it might be.

Your point about rib damage, etc is well-taken. Single barrel tests are planned, the point being that if OSR can be caused in them, no further testing might be required, since damage has occured. It may be that with current production bullets, no OSR will occur with the test barrels. This won't prove that it cannot occur, but would demonstrate that with the barrel type and specs, and the bullet type and load, it hasn't occured. I have a huch how we might generate a good dose of OSR, but I won't let that out yet... We'll see.

It may be that lead core bullets are here to stay. I hope so. But maybe not. As Wright says in his book, monos are probably going to increase, not decrease in popularity, so it behooves the shooting community to plan ahead. He also encouraged experimentation along these lines, and his encouragement is my motivation to instigate that experimentation.

Thanks for your post.