During the evolution of reduced caliber rifles experiments were made on cadavers at different ranges. In the published writings of these workers a great deal was said on the subject of highly destructive effects which are pretty generally described as explosive effects. The experimenters were careful to explain that these exaggerated and highly destructive effects were only seen when firing into cadavers at close ranges and when the bullet traveling at a maximum velocity happened to collide with resistant structures like the compact substance of bone in the diaphysis of the long bones, such as the femur, tibia, humerus, etc., and the head, as well as organs loaded with fluid or semifluid masses like the stomach, urinary bladder, and intestines. In other tissues offering but little resistance like lung tissues, soft parts generally, and epiphyseal ends of bone, the wounds inflicted were considered humane in character. Attention should be called to the infrequency of wounds showing explosive effects by the rifles of reduced caliber employed in the Turko-Balkan and Spanish-American wars. The same thing may be said of the Turko-Italian, Anglo-Boer, and Russo-Japanese wars, all of which were fought with the new armament.
The reason for the infrequency of the explosive effects in these wars is due to the fact that the battles were fought in the open at the ordinary battle ranges beyond the zone of explosive effects. This fact is all the more emphasized in the present world war, in which the rifle fire is employed principally in trench warfare at near-by ranges, and where all the wounds which involve the resistant structures of the body show the characteristic features usually described as those of explosive effects.
In describing the plates the terms used in connection with range are as follows:
(1) Close range, from 0 to 100 yards.
(2) Short range, from 100 to 500 yards.
(3) Mid range, from 500 to 1,000 yards.
(4) Long range, from 1,000 to 2,000 yards.
The wound effects of the modern military rifle bullet at various ranges are usually classified as follows:
(1) Explosive range, from 0 to 500 yards.
(2) Perforating range, from 500 to 1,500 yards.
(3) Penetrating range, from 1,500 to 2,500 yards.
The difficulty in adhering strictly to the last table as far as the characteristic features of wounds are concerned is this: In battle the chances of ricochetting of bullets is said to be in the proportion of one to three. Naturally, the moment a bullet ricochets it loses more or less of its remaining velocity. The destructive lesion to be expected from a given shot at a given range against a certain resistant structure can not be depended upon to occur as it will when the shot is made with scientific accuracy in the shooting gallery against cadavers.
Trajectory, or the curved line of flight of a projectile, has nothing to do with its wound-producing quality, except to increase the wound-producing frequency when it flattens and approaches the straight line of sight, because it will then pass through a greater portion of the space between the gun and the target, which may be occupied by men, without going over their heads. The greater the velocity, the flatter the trajectory becomes.
The American, German, and Turkish rifles, with about the same trajectory, can be fired through a tube 24 inches in diameter at a range of 500 yards, and the vertical rise of the curve of flight would not hit the top of the tube. But where the range is increased to 1,000 yards it would be necessary to enlarge the tube to a tunnel, 15 feet in diameter, in order to fire the bullet through it without striking the top in its greatly increased curve in flight.
Velocity is the principal factor of the wound-producing power of the small-caliber bullet, although the latter quality is definitely related to the cross-sectional area and weight as well as to the hard metal jacket which preserves its form. The greater the velocity of any particular bullet the more serious is its wound.