David,
When I had my side by side bent this summer, it looked to me like he opened the through bolt hole slightly. My stock does not look as though the wood pulled away. I think for through bolts this might have to be doneif they seperate. It was not opened significantly, just honed out a little. I would think clamping the barrels would not hurt them as long as only firm pressure, not significant pressure is applied by the wood clamp. If done right there is probably less chance of banging up the joint area of the gun.
Slivers, I am very thankful for the picture.
Do any of you know any good books on the subject of bending? I have looked but not found one yet.