All this talk about double triggers, single triggers, selective/non selective makes me laugh.
here is a true story that shows that it is reaally a problem that never existed.
I once sold a gorgeous Fausti Dea to a person ( whom is now a good friend)
The Dea was POW stocked, box lock with non selective single trigger with screw in chokes.
it's in 28 and I had two, the other was a completely custom ordered Ugartechea.
The Ugguie was English stocked, side locks with articulating front trigger and fixed IC/MOD chokes, IC on the left side because I like to use the back trigger first.
I preferred the Ugartechea soo sold the Dea to my friend.
We were talking about his new gun and how well he shot it. He told me between the club shoots, his own released birds, Sharp tails and wild roosters he had killed 194 birds with it that season.
Upon glancing at his barrels after he made a pretty long shot with the second barrel, I realized that the chokes were set backwards because before I sold it I had been shooting skeet with it so the first barrel was the MOD barrel and the second barrel was actually more open, at IC!
He had shot 194 birds with the chokes reversed, shooting the tighter choke first!
We switched the chokes and although I have watched him kill many birds since that first day, the birds don't die any quicker with the IC choke first.

Cat