This may be said: that 3 inches of inaccuracy is not much when many feet have to be judged, and that is perfectly true, and if the gun’s 3 inches of inaccuracy were always in the same direction as the game is going—that is, 3 inches too forward or too backward—there would be nothing in it to trouble about; but it is just as likely to be an error at right angles with the line of flight of the game, and then it does matter very much indeed. Even if a miss does not result, but if the aim is true, the game will then be made to fly through the thin part of the circumference of the shot column. For instance, if game is coming directly over the shooter, and a gun inaccuracy of 3 inches makes him shoot to right or left of the line of flight, that error is increased by his own inaccuracy or the “curl” of the game, which together may easily accomplish the other 12 inches, and then the game would be outside of the column of shot of a choke bore at 40 yards. A full choke has not a killing circle for straight going-away game of more than 26 or 28 inch diameter at that distance. On the contrary, a true cylinder has a killing circle of 40 inches.
This appears at first glance to be a very great advantage to the cylinder user, but in practice there is not much in it, provided the choke bore shoots truly to centre. If it does not, it is absolutely worthless, whereas the cylinder, with an equal fault, is a bad gun but not worthless. The reason of this is that the cylinder spreads more than the choke. The “full choke” always clusters its shot in the centre, and although the aim of gun-makers may be to get an even pattern, it cannot be done with a full choke gun, and would not suit everybody if it were done.
The author is inclined to think that a cylinder, or modified choke bore, is better than a full choke for any distance or purpose for which a full choke bore, with an even distribution of pellets, is better than another with a central clustering of pattern. Possibly pigeon shooting is an exception; because there is no use in killing outside the boundary, so that very long shots are not much wanted, and quick, hard shooting and an even, large pattern are required. But with game, accuracy of aim is preferable to extreme quickness, if either has to be sacrificed to any great extent. You go out to shoot to please yourself, and nothing will accomplish that pleasure so certainly as constantly killing game at distances that other people cannot reach. Tall pheasants and high wild duck try a gun as well as a gunner, and if the latter can keep in the line of flight he can shoot at some angles and at slow birds twice as strong with a choke as with a cylinder, but the timing of the shot is not as easy for one as for the other.
The shot spreads laterally nearly half as much again for the cylinder, but if you can keep your gun in the direction of the line of flight, that extra lateral spread will only help you for fast birds crossing at right angles. This is the least difficult thing to be done in killing driven game. The most difficult is accurately timing the shot, and here the gunner has the advantage of the longitudinal spread of the shot; in other words, a column of pellets some 30 feet long, at 40 or 50 yards, is sent in front of the game, which has to fly through the column as the latter passes the line of flight. The cylinder has slightly the longer column, and the column is slightly thicker through.
Correct timing implies that no part of the column of shot passes the bird before his head is in it, or after his legs are out of it. But this absolute accuracy of measuring the allowance in front, as well as timing the “let off,” must be very unusual.
It may be said that it is not easy to keep the gun in the direction of the line of flight, but the author cannot agree to that, except when the game swerves after the “let off.” If it does that, a spread of shot the size of a barn door would probably miss it, and the one-third bigger lateral spread of the cylinder than of the choke bore will not assist once in a hundred times.
These views, although not perhaps expressed, are largely acted upon in practice. Soon after choke-bore guns came in they became very unfashionable for game shooting, and the author was himself dreadfully unfortunate, for his form dropped 50 per cent. But the reason was that his first choke bores were not central shooters, and it was then very difficult to get guns of that boring that were true. That it was no fault of choke bores as such, the author proved by having his guns rebored, and although they afterwards shot even closer than before, they killed in the new condition.
One fault which is very bad in choke bores, and counts against shooting straight-going and straight-coming game well, far more than with cylinders, is that of patches without any shot in them in the outer edge of the circle. What is meant here is not a misdirection of the load but an erratic spread of it. In a close-shooting weapon this fault is almost as bad as a misdirection, but differs in this, that the patch varies its position with each shot. These patches sometimes extend from the outer edge to very nearly the centre of the pattern, and consistent shooting when they occur is impossible. They are not chance happenings, and can be obviated by good boring and good loading. The author thinks they most often occur when the shot can be shaken in the cartridge, and it may be that a size of pellets which do not lie evenly on the outer circle on the wad assist in deforming the pattern.
But theory is of no use, and it is the gun-maker’s business to sell a gun that he can show has none of these faults. Whether he overcomes them by a change in size of shot, quantity of them, or in an alteration of brand of powder, matters nothing to the shooter, and is not his affair. Enough has been said when the gun-buyer is placed in a position that it took the author many years to arrive at in regard to the choke bore, namely, that everything on the plate that is bad is not the fault of the shooter, but of the gun-maker.
There is another advantage of the choke bore. It shoots No. 5 shot at 50 yards as hard as No. 6 is shot by a cylinder at 40 yards, and the pattern will be quite equal at 50 yards with the large shot to that of the cylinder’s small shot at 40 yards.