Lloyd- I'm familiar with elastic limits and my comfort level with 'the dark side' is happily high. Basically I just meant that I'm not going to feed an antique shotgun a steady diet of high-pressure loads, not because I'm worried about the barrels but because I am worried about excessive wear on other parts of the gun.
Excellent. Your're another example of the rapid "learning curve" experienced by people once they become members of this board. All due to Dave and all the other learned folks who post here. This board is truly like no other.
Regards
Ken