Having built a steel skateboard affair with L bracket to hold butt, I have seen evidence that such things really can wreck stocks, especially if the wood is a bit cheesy and too much lead is loaded. I think the human has to take some of the recoil, at least. I like Dugaboy's rucksack idea and have already made mechanical efforts along those lines (can't say too much yet). You are probably right about the sensitivity of db rifles but if this hands-on need were absolute, every owner would have to regulate his own. For instance, a tall thin man would not be able to set up a rifle for a short fat man.

Cheers
- Paul