The Definition of Group
A set of holes in a target left by a succession of bullets fired from the same rifle or handgun,
using the same ammunition and sight setting. Fired (within the limits of one's marksmanship ability)
to determine the inherent accuracy of the rifle/ammunition combination,
and to aid in the proper adjustment of the sights.
19 Other Firearms Definitions You Need To Know
A shooting position in which one or both knees are touching the ground and the shooter is as low as possible.
The substance which imparts movement to the projectile in a firearm. In a firearm, usually powder. In an airgun the propellant is air or Co2
A type of lock in which the hammer pivots in a vertical arc, striking the nipple on the underside of the barrel.
Since the nipple's flash channel goes straight into the powder at the breech end of the barrel, ignition time is very fast.
For this reason, and because it gets the hammer out of the way, underhammer locks are commonly used on muzzleloading
benchrest rifles which are used for target shooting, and where accuracy is the goal.
A description of a bullet whose forward diameter has expanded after penetration.
The relationship between a bullet's weight and its diameter. A long bullet, such as the original 7.62x54R
loading for the Mosin Nagant 91/30, will have a high sectional density and consequently greater
penetration than a shorter bullet of similar construction. A shorter bullet with less sectional
density will have relatively less penetration, but greater knockdown power.
Smith & Wesson term for a revolver grip design introduced in the 1930s where the top of the grip extends higher than it had in earlier configurations, to provide a more comfortable hold.
The interval of time between trigger release and the detonation of the primer. Generally, the faster the lock time the better, because this makes it easier to shoot accurately.
By convention, powerfully loaded shotgun cartridges for hunting are generally manufactured with relatively longer brass end-caps than lower
powered cartridges intended for target shooting. While different-sized brass bases are of virtually no consequence to the strength of the
shell in relation to the steel breech of the gun itself, they do help the shooter identify the relative power of cartridges at a glance.
An unexpected and undesirable discharge of a firearm caused by circumstances beyond the control of the participant(s) such as a mechanical failure or parts breakage.
There are very, very few firearms related "accidents" and if the "Three Rules" are followed there will hopefully be no injury.
Accidental Discharge should not be confused with "Negligent Discharge".
A shotgun, often with only a single relatively-long barrel, with relatively tight choke boring and a relatively high-combed stock used for shooting clay pigeons in the game of Trap,
where the birds are launched at least 16 yards ahead, usually rising and going away from the shooter at relatively low angular velocity.
To better absorb recoil, a trap gun is normally heavier than a field gun because one shoots a lot but walks only a little.
A device fitted inside the buttstock of a heavily-recoiling gun or rifle, usually containing mercury and a valve.
As the gun recoils, the mercury is displaced temporarily, increasing the duration, and thus diminishing the
perceived impact of the recoil. The added half-pound of weight doesn't hurt either.
The entire process of making the trigger complete its journey past the trigger break.
A firearm loaded through the breech.
A strong spring which activates the striker or hammer of a firearm.
A rifle or shotgun stock that has a Monte Carlo style comb
The firing mechanism of a a muzzle-loading weapon. In breech-loading firearms, the lock is the firing mechanism and breech-sealing assembly.
A sliding bar, running longitudinally through the watertable of a break-open side-by-side gun's action, with openings through which the
lumps of the barrels pass when the gun is closed. Under spring tension, this bar moves forward when the opening control is released and its
two locking surfaces engage complementary slots (bites) in the rear of the two barrel lumps. Originally operated by a hinged tab in front
of the trigger guard. Now invariably operated by a cam from Scott's [toplever] spindle. Most modern side-by-side guns lock closed in this manner.
The term used for the casing on modern rifle and pistol ammunition. It is usually made out of brass but can also be aluminum or steel.
The casing on a shotgun shell is usually refered to as a hull
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