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Obturation is the necessary barrel blockage or fit in a firearm or airgun created by a deformed soft projectile. [1] A bullet or pellet made of soft material and often with a concave base will flare under the heat and pressure of firing, filling the bore and engaging the barrel's rifling.
Before the barrel can release the bullet in a consistent manner, it must grip the bullet in a consistent manner. The part of the barrel between where the bullet exits the cartridge, and engages the rifling, is called the "throat", and the length of the throat is the freebore. In some firearms, the freebore is zero as the act of chambering the ...
Lead bullet being supported by a wooden cup sabot in a Delvigne gun. A cup sabot supports the base and rear end of a projectile, and the cup material alone can provide both structural support and barrel obturation. When the sabot and projectile exit the muzzle of the gun, air pressure alone on the sabot forces the sabot to release the projectile.
[36]: 32 The three main class characteristics of all bullets are the lands and grooves, the caliber of the bullet, and the rifling twist. [37] All three can be tied directly to the type of barrel that was used to fire the bullet. [37] The lands and grooves of barrel are the bumps and valleys created when the rifling is created. The caliber is ...
An open single-cavity bullet mold and a closed two-cavity mold. A cast bullet is made by allowing molten metal to solidify in a mold.Most cast bullets are made of lead alloyed with tin and antimony; but zinc alloys have been used when lead is scarce, and may be used again in response to concerns about lead toxicity.
.31 ball/conical bullet 5 United States: c. 1847–1873 Colt Model 1855 Sidehammer Pocket Revolver "Root" Colt's Patent Firearms Manufacturing Company.31 ball/conical bullet.28 ball/conical bullet 5 United States: c. 1855–1870 Colt Model 1862 Pocket Police: Colt's Patent Firearms Manufacturing Company.31 ball/conical bullet 5-6 United States
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Test barrel length: 15 cm (5.9 in) Source(s): Ammo Encyclopedia, 2nd Edition, Page 690, Michael Brussard The Swiss 7.5mm center-fire revolver cartridge, also known as 7.5x23mmR, was used militarily in the 1882 and 1882/1929 revolvers of the Swiss army , as well as in Swiss civilian revolvers of the 'bulldog' type.