My son made an unbelievable shot on a black duck on his first hunt 40 years ago. I didn't bother getting up because it was beyond my range limit. He was using a hammer Parker 0 frame 16 gauge. Only many years later when I got a Parker letter did I learn it was bored cylinder right barrel. With today's wads and harder shot, I'm convinced that opening chokes is the way to go. I'm having a couple barrels done now.