European Guns.—The Enfield Rifle; Muzzle Loader, Cal. 577; 3 grooves; regular twist, slightly deeper at breech than at the muzzle; rifling one turn in 6 feet 6 inches.
The Purdy Rifle, Muzzle Loader; Cal. 650; 4 grooves; increasing twist, commencing at one turn in 6 feet and ending at one turn in 4 feet 9 inches.
The Wilkinson Rifle, Muzzle Loader, Cal. 530; 5 grooves with a regular twist of one turn in 6 feet 6 inches.
The Lancaster Rifle, Muzzle Loader. Bore smooth and elliptical diameter at muzzle; greater axis, 550; lesser axis, 540; greater axis at breech, 557; lesser axis, 543. The twist is one quarter turn in whole length of barrel. Length of barrel, 39 inches.
The Snider Rifle, Muzzle Loader; Cal. 577; 5 grooves, one turn in 4 feet.
The Whitworth Rifle, Muzzle Loader. Polygonal or hexagonal form of bore. Rifling, one turn in 20 inches. Bore, 564 across the flats. 568 across center of flats.
The Jacobs Rifle, Muzzle Loader; 4 grooves; loads and grooves equal. Rifling four-fifths turn in 24 inches.
The Turner Rifle, Muzzle Loader. Bore, 568. Rifling Turner’s Patent, one turn in 4 feet.
The Rigby Rifle, Muzzle loader. Rifling 6 grooves; one turn in 4 feet.
The Boucher Rifle, Muzzle Loader. Bore hexagon with angles, rounded off so as to form shallow grooves, 608 deep in center. Bore, 570. Rifling one turn in 3 feet 3 inches.
The Prussian Needle Gun, Breech Loader. Rifling 4 grooves, one turn in 40 inches.
The Chassepot Rifle, Breech Loader; Cal. 433; rifling 4 grooves, turning from left to right, one turn in 21½ inches.
The Snider Enfield, Breech Loader. Rifling 3 grooves slightly deeper at breech than at the muzzle, one turn in 78 inches. Diameter, 577. Depth of rifling at muzzle, 05. At breech, .13. Width of grooves three-sixteenths inch.
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.
Wesson’s Muzzle Loading Rifle. Barrel 2′ 8″ long. Rifling one turn in 3′ 6″ 6 grooves; space between grooves equal to interior surface presenting a dovetail appearance. Groves not so wide as spaces.
The Whitney Arms Co.’s Guns, Breech Loading, comprising the Whitney, Kennedy, and Phœnix systems. Rifling 6 grooves, one turn in 22 inches. Lands and grooves of equal width.
Marston’s Rifle (Toronto, Canada), Muzzle Loader, number of grooves 6, lands and grooves equal width; regular twist, one turn in 30 inches; depth of groove 15-thousandths inch, slightly freed at breech.
Pistols.—Colt’s Army Pistol, Breech Loading Revolver, Cal. 45. Rifling 6 grooves, twist uniform, one turn in 16 inches; depth .005.
Schofield, Smith & Wesson Revolver for Army Use, Breech Loader. Bore, .435. Number of grooves 5, uniform twist, one turn in 20 inches. Depth of rifling .0075.