Most are barking up the wrong tree. With the much older DR's, yes you should fire off the front trigger first for regulation(and risk doubling.) With today's DR's made with modern alloy steel, there's no need as you can fire the rear trigger first and front last and still get the same group as doing it viseversa.
-------------------- Lo do they call to me,
They bid me take my place among
them in the Halls of Valhalla,
Where the brave may live forever.