ACCURACY AND POWER
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ACCURACY AND POWER

ACCURACY AND POWER




      

ACCURACY AND POWER


ACCURACY AND POWER

Accuracy has been pretty well treated under the head of cartridges and elsewhere but it will do no harm to sum up here. The miniature cartridges should be capable of keeping ten shots in a one-inch circle at fifty yards. In such ammunition velocity and power are not of moment. Small game cartridges should have an accuracy capable of keeping ten shots in a three-inch at one hundred yards, velocity not less than 1,700 feet, and energy of five hundred pounds or better. Deer and antelope ammunition ought to be accurate enough to keep ten shots in a six-inch circle at two hundred yards, with a two hundred trajectory of not greater than six-inches, and striking force of 1,500 foot pounds or more.

Rifles for longer range game work, suitable for moose elk, caribou, mountain sheep, should have an accuracy equal to a six-inch pattern at two hundred yards, or preferably a four trajectory of not greater than a four-inch at two hundred yards, velocity above 2,500 feet, energy from 2,000 to 3,000 foot pounds. Rifles of big bore for long range use should be capable of keeping a string of shots in an eight-inch circle at two hundred yards. Velocity should be from 2,400 to 2,600 feet, with trajectory to correspond. The power would range from three thousand to four thousand foot pounds.

Jungle rifles should be accurate enough to keep ten shots in a ten-inch circle at two hundred yards, velocity from 2,000 to 2,400 feet, energy from four to five thousand pounds. Elephant rifles should keep ten shots in a fifteen-inch, with velocity above two thousand feet, and energy of not less than five thousand foot pounds. In the case of match cartridges it is not worthwhile to give energy, trajectory, or velocity and they will be omitted from the table.

Most of the figures in the ballistic table which follows are taken from the catalogs of the Winchester and U. M. C. companies and may be accepted as correct. The ballistics of English cartridges are taken from the catalogs of Jeffery, Greener, and Westley-Richards. Usually their statements are rather indefinite, being about so and so—they fail to supply figures for free recoil, and that had to be calculated. Some of the figures for foreign cartridges I have secured from the American agents and I cannot vouch for their correctness. Probably they are approximately true.

It is human nature for a manufacturer to make the best possible showing for his arms and ammunition. For example, one agent who had a rifle giving a muzzle velocity of 2,900 feet gave the trajectory as considerably flatter than that of another rifle with similar weight and shape of bullet, having a speed of 3,100 feet; some builders with rifles having ballistics similar to the '06 gave the free recoil as about half the '06—in that case I had to do some guessing myself. Free recoil of automatic arms cannot be obtained in any instance.

Askins, Charles. Rifles and Rifle Shooting. New York: Outing, 1912. Print.

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