I have a right handed shooting partner who had problems with his DT SxS doubling on him. The triggers were in perfect alignment. Apparently, when he fired his right barrel's front trigger, his finger was slipping back and hitting the rear trigger. The problem was solved when he had the triggers bent (very little) so the front one was slightly to the right of the back one. Possible explanation for the standard layout?

Sample my new book at http://www.theweemadroad.com