Westley Richard’s, Breech Loader. Bore octagonal form. Rifling one turn in 20 inches.
Regulation Minie Rifle, Muzzle Loader. Rifling one turn in 6 feet 6 inches.
American Guns.—The Peabody-Martini Rifle, Breech Loader. Rifling 7 grooves, one turn in 22 inches, gain twist, lands and grooves of equal width.
Maynard Rifle, Breech Loader. Rifling 3 grooves, one turn in 5 feet, lands and grooves equal width; depth, .01.
Sharp’s Rifle, Breech Loader. Lands and grooves equal width. Rifling one turn in 20 inches.
Bown & Sons’ Kentucky Rifle, Muzzle Loader. Standard number of grooves 7, but made with 4, 5, 6, and 7 grooves, same width as lands. Even twist one turn in 42 inches. Gain twist commences at 9 feet and ends at 6 feet.
Powel & Son’s Breech Loading Rifle, 6 and 7 grooves, one turn in 36 inches.
Steven’s Rifle, Breech Loader. Regular twist, one turn in 26 inches.
Springfield, U. S. Rifle, Breech Loader, Cal. 45. Rifling 3 plain concentric grooves. Lands and grooves equal width. Uniform twist, one turn in 22 inches, depth .005.
Frank Wesson’s Rifle, Breech Loader. Long and mid-range guns using long slugs, even twist, one turn in 18 inches, grooves 6, lands and grooves equal width. Short range guns, using slugs having short bearing, increase twist commencing on 6 feet, and ending on 2 feet, 5 and 6 grooves, lands and grooves of equal width.