William Bruce Leffingwell,
The Art of Wing Shooting: A Practical Treatise on the Use of the Shotgun, 1895
http://books.google.com/books?id=e34EmE3tkfkC The king of all pigeon shooters is Capt. Jack (John L.) Brewer of Philadelphia.
Mr. Brewer said to the author:
The secret of pigeon shooting is to kill the birds quickly, they must not be permitted to become hard birds; the quicker the first barrel is fired the better, and the second must follow before the bird is forty yards from the shooter. I can't say that I admire these long kills, because the fact that a man makes a long kill shows that he was slow in the use of the first or second barrel, and that won't do in pigeon shooting.
A pigeon gun should be a modified choke both barrels. The first barrel being bored a little closer than a cylinder, and the second a little more open than a full choke. Bored in that manner, the first barrel will kill the bird within from thirty-five to thirty-seven yards, and the second up to forty yards, and the pigeon ought not be permitted to get beyond that distance when the second barrel is fired. A man must take every legitimate advantage in pigeon shooting. A modified choke gives that advantage, and when a man uses a full choke he handicaps himself.
A gun for pigeon shooting should weigh from 7 1/2 to anywhere under 8 pounds. It should be heavy at the breech, with a long and very straight stock, having a drop from 2 to 2 1/2 inches at the butt. These straight stocks are desirable, because they cause one to shoot high, something which is essential, as there is a tendency to undershoot, and nearly every pigeon is missed by shooting under or behind. A pigeon gun should be bored to shoot a trifle high. Birds going from the trap are almost invariably rising, and as there is an almost uncontrollable tendency to aim at a straight-away bird, one should hold a trifle over.
Brewer who stood very straight, which was atypical then
