No I haven't had one yet, at least from a rifle. Certainly have done it with a 12 gauge shottie but it wasn't too dramatic and not really not that noticeable (and none of my shotguns have rubber pads at all).

My question to the engineering double experts.

Can a double discharge damage a double rifle? Or are they designed so that a rare double discharge really isn't that dramatic except to one's shoulder.

My question is based on the vibrations on the two barrel sets where during a double discharge instead of one single set of vibrations being "unopposed" instead two opposing sets of vibrations are set in force.

Also the fact that shooting true solid bullets such as monoblocs and X-bullets is discouraged in doubles as the bullets presumably do not have enough "give" in the rifling and can cause excess vibrating and damge to the barrels and weld between the barrels.

Of course there is also the issue of double the normal recoil force on the face and the stock.

Any comments would be welcomed.