* * * * *
To those who are amateurs of the rifle, I would recommend a pamphlet, written by Chapman, and published in New York; it is chiefly intended for those who delight in the infantine or octogenarian amusement of peppering a target, but it also contains many points of interest. Among other subjects discussed are the following:—The quantity of twist requisite in a rifle barrel—the gaining twist, as opposed to Mr. Greener, and the decreasing twist—the size of ball best suited to different distances—the swedge, by which a ball, being cast rather larger than requisite, is compressed into a more solid mass—the powder to use, decreasing in size of the grain in proportion to the diminishing length of barrel—the loading muzzle, by which the lips of the grooves are preserved as sharp as a razor, &c. The pamphlet can easily be procured through Messrs. Appleton, of New York and London.
[Footnote CP: The miles of distance may not be quite exact, but the miles of wire may be depended upon.]
[Footnote CQ: The trial between the Enfield and the Whitworth rifles cannot be yet considered conclusive, as there was a difference in the bore of the rifles, and also Mr. Whitworth used a different kind of ball for penetration to that used for long range.]