Blank (cartridge)

Blank cartridges, as used in nail guns

Yugoslavian 7.9 mm (7.92 x 57 mm or 8 x 57 Mauser) blank cartridges.

Blank fired from a cannon during a civil war re-enactment.

A blank is a type of cartridge for a firearm that contains gunpowder but no bullet or shot. When fired, the blank makes a flash and an explosive sound (report).

It should not be confused with a dummy, which does not contain gunpowder, may or may not contain a live primer and may or may not be inert.

Applications

Blanks are commonly used when the sound and flash of gunfire is needed, but a projectile would not be safe, such as in military training maneuvers, in movies that require gun fights, and in starter's pistols to signal the beginning of races. Blanks used by the military are usually used with a special blank-firing adaptor in the firearm that constricts the barrel, keeping chamber pressures from the blank high enough and for long enough of a duration to cycle the firearm's action. For movie use, specially designed blank firing firearms are often used, which increases the margin of safety as they cannot be loaded with live ammunition. The 5-in-1 style of blank, designed to cycle through firearm actions and fit a variety of firearm chambers, is also commonly used in real firearms for dramatic effect.

Special blank cartridges are also used for applications where the explosive power of a cartridge is needed, but a projectile is not. Blank cartridges were commonly used for launching rifle grenades, though some types of grenades are capable of trapping the bullet of a live round. Larger blanks are also used in line launching guns, such as the line launching kit for the Mossberg 500 shotgun.

Blank rimfire cartridges, commonly called power loads, are also used in some nail guns (powder-actuated tools), where the power is tapped to force a heavy piston into the nail, with enough force to bury its full length in steel or concrete.

Some forms of fast draw competitions use special blanks that are loaded with a layer of slow burning rifle powder on top of a thin layer of faster burning pistol powder. The pistol powder ignites the slower burning rifle powder, and fires it out the barrel much like a shotgun shell. The burning powder only travels a few yards before it completely combusts, but that is far enough to burst the balloon used as a target for those competitions. Wax bullets are also commonly used for competitions and training where a non-lethal projectile is required.

A blank cartridge may also be issued to a randomly selected shooter in an execution by firing squad, on the theory that each of the shooters may take comfort in the fact that they may not have fired a live round. This tradition dates back to before cartridge arms, when a muzzle loading musket would be loaded without a ball.

Safety

The appearance of a blank cartridge is deceptively harmless and can give a false sense of safety. Although blank cartridges do not contain a bullet, precautions are still required because fatalities and severe injuries have resulted on occasions when blank cartridges have been fired at very close ranges.

Blank cartridges frequently contain a paper or plastic plug which seals the powder in the case called a wad. This wad can cause bruising at medium ranges and severe penetrating wounds at close range. There is also a cloud of hot, expanding gas which is expelled at extremely high velocity from the muzzle when a blank cartridge is fired. These high velocity gases can inflict severe injuries (see powerhead for an example) at close ranges. Additionally, if there is any small debris lodged inside the barrel it will be expelled at a similar velocity to a bullet, with the ability to inflict a severe wound. Finally, the extremely loud noise of blanks being fired can damage the hearing of people in the immediate area.

In general, such incidents occur when blank cartridges are fired by people who are unaware of their destructive capabilities. Actors in particular are at serious risk of injury from blank cartridges used on movie sets. Brandon Lee and Jon-Erik Hexum were both killed in accidents involving blank cartridges. Lee was killed by an old cartridge fragment lodged in the gun that was propelled with lethal force by the blank cartridge, while Hexum was killed as the wad from the blank fractured his skull, sending bone fragments deep into his brain.

See also

• Coffman engine starter

External links

• World Fast Draw Association resource page, includes video instructions for loading blank cartridges for Fast Draw
• Definition of "movie" or "5-in-1" blank
• The ABCs of PATs, information on powder-actuated tools and power load blanks