Any decent double should be able to give the shooter his choice of barrels, especially if one is carrying a soft nose and a solid depending on the scenario. That said, it is conventional wisdom to fire the front trigger first, and most doubles have the rear trigger set to a heavier pull to avoid doubling. The doubling malady is one that has afflicted Merkels in the past as Paladin alluded to, and my understanding is this has been corrected by them.

A good principle to guide me through life: “This is all I have come to expect, standard lackluster performance. Trust nothing, believe no one and realize it will only get worse…”