The penetration must be arranged by varying the material of the bullet. A certain number of cartridges should be loaded with bullets of extreme hardness, intended specially for large thick-skinned animals; other bullets should be composed of softer metal, which would expand upon the resisting muscles but would not pass completely through the skin upon the opposite side. The cartridges would be coloured for distinction.
If the metal is pure lead, the bullet '577, with an initial velocity of 1650 feet per second, will assuredly assume the form of a button mushroom immediately upon impact, and it will increase in diameter as it meets with resistance upon its course until, when expended beneath the elastic hide upon the opposite side, it will have become fully spread like a mature mushroom, instead of the button shape that it had assumed on entrance. I prefer pure lead for tigers, lions, sambur deer, wapiti, and such large animals which are not thick-skinned, as the bullet alters its form and nevertheless remains intact, the striking energy being concentrated within the body.
The difference in the striking energy of a hollow bullet from that of a solid projectile is enormous, owing to the inequality in weight. The hollow bullet wounds mortally, but it does not always kill neatly. I have seen very many instances where the '500 hollow Express with 5 drams of powder has struck an animal well behind the shoulder, or sometimes through the shoulder, and notwithstanding the fatal wound, the beast has galloped off as though untouched, for at least a hundred yards, before it fell suddenly, and died.
This is clumsy shooting. The solid bullet of pure lead would have killed upon the spot, as the bullet would have retained its substance although it altered its form, and the shock would have been more severe, The hollow bullet exhibits a peculiar result in a post-mortem examination: the lungs may be hopelessly torn and ragged, the liver and the heart may be also damaged, all by the same projectile, because it has been converted into small shot immediately upon impact. Frequently a minute hole will be observed upon the entrance, and within an inch beneath the skin a large aperture will be seen where an explosion appears to have taken place by the breaking-up of the lead, all of which has splashed into fragments scattering in every direction.
Common sense will suggest that although such a bullet will kill, it is not the sort of weapon to stop a dangerous animal when in full charge. Weak men generally prefer the hollow Express because the rifle is lighter and handier than the more formidable weapon, and the recoil is not so severe, owing to the lightness of the bullet.
My opinion may be expressed in a few words. If you wish the bullet to expand, use soft lead, but keep the metal solid. If you wish for great penetration, use hard solid metal, either 1/10 tin or 1/13 quicksilver. Even this will alter its form against the bones of a buffalo, but either of the above will go clean through a wapiti stag, and would kill another beyond it should the rifle be '577 fired with 6 drams of powder.
The same rifle will not drive a soft leaden solid bullet through a male tiger if struck directly through the shoulder; it will be found flattened to a mushroom form beneath the skin upon the other side, having performed its duty effectively, by killing the tiger upon the spot, and retaining intact the metal of which it was composed.
A post-mortem inquiry in the latter case would be most satisfactory. If the bullet shall have struck fair upon the shoulder-joint, it will be observed that although it has retained its substance, the momentum has been conveyed to every fragment of crushed bone, which will have been driven forward through the lungs like a charge of buckshot, in addition to the havoc created by the large diameter of an expanded '577 bullet. Both shoulders will have been completely crushed, and the animal must of course be rendered absolutely helpless. This is a sine qua non in all shooting. Do not wound, but kill outright; and this you will generally do with a '577 solid bullet of pure lead, or with a Paradox bullet 1 3/4 ounces hard metal and 4 1/2 drams of powder. This very large bullet is sufficiently formidable to require no expansion.
Gunmakers will not advise the use of pure lead for bullets, as it is apt to foul the barrel by its extreme softness, which leaves a coating of the metal upon the surface of the rifling. For military purposes this objection would hold good, but so few shots are fired at game during the day, that no disadvantage could accrue, and the rifle would of course be cleaned every evening.
The accidents which unfortunately so often happen to the hunters of dangerous game may generally be traced to the defect in the rifles employed. If a shooter wishes to amuse himself in Scotland among the harmless red deer, let him try any experiments that may please him; but if he is a man like so many who leave the shores of Great Britain for the wild jungles of the East, or of Africa, let him at once abjure hollow bullets if he seeks dangerous game. Upon this subject I press my opinion, as I feel the immense responsibility of advice should any calamity occur. It is only a few months since the lamented Mr. Ingram was killed by an elephant in the Somali country, through using a '450 Express hollow bullet against an animal that should at least have been attacked with a No. 10. I submit the question to any admirer of the hollow Express. "If he is on foot, trusting only to his rifle for protection, would he select a hollow Express, no matter whether '577, '500, or '450; or would he prefer a solid bullet to withstand a dangerous charge?"