I shoot trap at 16yds with an extra full choked Beretta (0.685) If I used spreaders I wonder how much difference that would make on my hit percentage. For grouse in the woods I like a 30" barrel, choked modified or less, sometimes full in the left and mod to open in the right. I don't miss too many unless I'm slow off the starting line. Just not sure what spreaders would achieve in my case.

Nothing is foolproof to a sufficiently talented fool.