Rifle powder

Individual chemicals may be so prepared or mixed to be suitable for use as either deflagrating or detonating explosives. Explosives find wide use as mining and constmction to blast ore, coal, and rock in petroleum prospecting and oil well production in manufacturing to bond metals and manufacture diamonds as pyrotechnics and in the aerospace Industry. Military explosives are used in demolition, ammunition, pyrotechnics, signals, and the like. 

In transportation terms, explosives are divided into six divisions (1.1 to 1.6) based on the (1) speed with which they react (2) sensitivity and modes of initiation (3) explosive power and (4) effects of the packaging or article to contain the explosive. 

Explosives are further assigned to one of thirteen compatibility groups (A through H, J, K, L, N, S) which identify the explosive article or substance and allow identification of other compatible explosives. 

A large number of chemicals, usually organic compounds of carbon, hydrogen, nitrogen, and oxygen, exhibit explosive properties  

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Blkhsen-niilch, /. condensed (or evaporated) milk, -miihle, /. barrel mill, -pulver, n. rifle powder, -schuss, m. gunshot, -stein, m. iron pyrites. 

Gewehr, n. (small) arms, gun, rifle, -geschoss, n. bullet, -granate, /. rifle grenade, -mum-tioQ, /. small-arms ammunition, -pulver, n. rifle powder. 

Petard simulating the fire of a battery, used in order to deceive the enemy about the location of gun batteries. Most of these petards consisted of charges of rifle powder enclosed in wood or cardboard boxes, reinforced with cord or wire... 

K2Cr207 25, KMn04 7%. No 2 Sporting Powder Amm Picrate 73, K2Cr207 20, KMn04 7%. No 3 Rifle Powder Amm Picrate 50,... 

Henrite. Brit 33 grain NC rifle powder manufactured since 1900... 

In addition to dynamite manufacture, the Kenvil plant was equipped shortly after the assignment to Hercules to manufacture about 1500 lbs/day of smokeless shotgun and rifle powder. The brands which became Hercules property included Bullseye and Unique. ... 

M. von Duttenhofer (1843-1903) nitrated brown charcoal (used for prepn of C/82) by Schultze s method to obtain colloided rifle powder RCP (Rottweiler Cellulose Pulver) which was adopted by the German Army in 1884, but its compn was kept secret until 1887 (See also Vol 5 of Encycl, p D1581, under Duttenhofer s Smokeless Propellant ) (Ref 44, p 244)... 

Jalnias Powders. The following compns for Cannon Powder - KN03 75, Na Picrate 3, sulfur 10, coal 10 KC103 2% and Rifle Powder — KN03 15, Na Picrate 8, sulfur 10, coal 15 KC103 2% are found in Ref Ref Perez Ara (1945), p 223... 

Most commonly used for fire-arms e.g. as rifle powder. 

A large content of diphenylamine may be particularly detrimental to the ballistic properties in fine-grain (rifle) powders. That is why 0.5-1.0% diphenylamine is used in these powders whereas in slower burning cannon powders 1.5-2.0% is used. 

The semi-colloidal powders are designated in every country according to the purpose for which they are intended. In the U.S.S.R. (Gorst [1]) rifle powders were formerly given the letter B (Russian Y from the word vintovka i.e. rifle) followed by another letter denoting the type of projectile to be used, thus BA (Russian VL) for powder for light projectiles, BT (Russian YT), for powder for heavy projectiles. 

The yield of a press depends not only on its design, applied pressure and the dimensions of the extruded strip or tube, but also on the plasticity of the dough. The effect of the dimensions of a strip or tube on the yield of the press is illustrated by the following examples. In a press of the Champigneul type, when pressing a strip 0.70 mm thick for rifle powder (total solubility 30%, amount of solvent 120%), the yield is 90 kg/hr. When pressing a strip 2.8 mm thick (total solubility 40%,... 

After being cut the powder should be graded to remove irregularly-shaped flakes, strips or tubes. The quantity of waste depends on the shape of the powder, its dimensions and on the condition of the cutters. With flake rifle powders, for instance, the... 

Flake or tubular rifle powder should be subjected to surface gelatinization and coating with graphite. This is usually called polishing and constitutes the most delicate operation in the manufacture of rifle powder (for calibres from 7.6-20 mm). 

In some countries (U.S.A.) DNT is used for the surface coating of tubular rifle powder, instead of centralite or camphor. The polishing is carried out in the presence of water at a temperature of 80°C, i.e. above the melting point of DNT. As the polishing proceeds, the water is removed by evaporation under reduced pressure, the DNT remaining on the surface of the powder tubes. 

For powders which require a high precision in manufacture (polished rifle powders) the ballistic properties are determined for the contents of each polishing drum charge and the contents of all the drums are blended on the principle that powders of various ballistic properties give a mixture with properties corresponding to the arithmetic mean. 

The standard specifications permit the moisture content to range within certain limits. This enables the producer to regulate the moisture content to obtain the required ballistic properties. If the powder is too vivacious it should be moistened to the upper limit, while if it is less vivacious, the lower limit is preferable. In determining the moisture content the following practical rule should be observed. In rifle powder an increase of the moisture content by 0.01% lowers the muzzle velocity v0 by 4-5 m/sec and the pressure by 50-70 kg/cm2. In cannon powder the variations of ballistic properties are smaller and depend on the type of powder and on the calibre of the gun. 

Eagle Duck and Eagle Rifle Powders (Amer). 

Figube 77. Smokeless Powder Blending Tower. The powder is blended by being made to flow through troughs and bins. Lots as large as 50,000 pounds of rifle powder and 125,000 pounds of cannon powder have been blended in this tower. 

Rifle Powder of Muraour (Fr). A cool burning propint consisting of collodion cotton (N 11.7%) 67, DEGDN 22, sym centraRte 9 and K sulfate 2%... 

Dupont shotshell powders Hi-Skor 700-X Double Base, PB, SR-4756, SR-7625, and IMR-4227 rifle powders IMR-3031, 4064, 4198,4227, 4320, 4350,4831 and 4895 pistol powders PB, IMR-4227, Hi-Skor 700-X, SR-7625, SR-4756, IMR-3031 and IMR-4198 Hercules shotshell powders Herco, Unique, Blue Dot, Red Dot and Green Dot, rifle powders. Unique, Reloder 7 and Hercules 2400 pistol powders Unique and Bullseye... 

Crawford bomb 66 cresylite = mixture of trinitrocresol and picric acid (french) crimping 66 critical diameter 66 CR-propellants = RDX containing rifle powders (USA) cross section ratio -> propellant area ratio 269 crusher 149 362 C.TD. = coefficient of detonation transmission (coefficient de self exitation) (french) 87 CTPB = carboxyl-terminated polybutadiene (USA) 61 329 cumulative priming 66 c.u.p. = coefficient d utilisation pratique (french) 198 cuprene 52 cupric salicylate 163 curing 67... 

Uses See Guncotton, Improved Military Rifle Powder. 

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