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These are both more energetic by mass than black powder and can produce higher velocities and pressures. Triple Seven is a volumetric substitute for black powder, and due to its higher velocity, it is recommended to reduce the load by 15%. [11] The carbon-based fuel burned in this case is from the sugar family, not from charcoal.
The PC77, or "Pumpmaster 77", is essentially a 1377c with different stamped markings and black plastic for sale at a lower price point. Several iterations of the 1377 exist. Models include: First variant with steel breech and sliding breech cover, Phase I, 1977-1981; Second variant with plastic breech Pellet/BB, Phase II, 1981-1999
Single-base nitrocellulose propellants are hygroscopic and most susceptible to degradation; double-base and triple-base propellants tend to deteriorate more slowly. [7]: 313 To neutralize the decomposition products, which could otherwise cause corrosion of metals of the cartridges and gun barrels, calcium carbonate is added to some formulations.
Shot is a collective term for small spheres or pellets, often made of lead. These have been projected from slings since ancient times and were the original projectiles for shotguns and are still fired primarily from shotguns and grenade launchers , while they are less commonly used in riot guns .
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.177 caliber or 4.5 mm caliber is the smallest diameter of pellets and BB shots widely used in air guns, and is the only caliber generally accepted for formal target competition. It is also sometimes used for hunting small game, like fowl .