The Definition of Magnum
From the Latin for "more."
A term indicating a relatively heavily loaded metallic cartridge or shotshell and a gun safely constructed to fire it.
It generally indicates a round which cannot be interchanged with other loadings of the same caliber (for example, a .22 Magnum shell does not fit within a firearm designed to fire .22 Long Rifle ammunition).
19 Other Firearms Definitions You Need To Know
A popular term for a short barreled repeating shotgun as frequently used in law enforcement and personal protection.
Slang word abreviation for Ammunition.
The part in the breech mechanism that locks the action against the firing of the cartridge.
A constriction at or near the muzzle of a shotgun barrel that affects shot dispersion.
The spotter is a helper who gives the shooter guidance on how to hit a particular target.
In some cases the spotter may just report the location of the bullet impact. In other cases they may judge the speed and direction of
the wind, determine the range, and give the shooter the settings to be used on the sights.
The single projectile expelled from a gun. It is not the same as a cartridge, the cartridge is complete package,
which includes the case, primer, powder, and bullet, which is called or a round. Bullets can be of many materials, shapes,
weights and constructions such as solid lead, lead with a jacket of harder metal, round-nosed, flat-nosed, hollow-pointed, etc.
Fouling of a firearm bore by metal particles from bullets adhering to the metal surface caused by heat or friction.
A smooth bore long gun that shoots a group of pellets called shot instead of bullets.
Depending on the bore size and the size of the pellets there may be from less than 10 to two hundred or more pellets in a single shotgun cartridge.
Shotguns are designed for shooting moving targets (such as flying birds or running rabbits) at close range.
An offset of a gun stock to the right, so
that the line of sight aligns comfortably with the right eye while the butt of the stock
rests comfortably on the right shoulder. Almost all right-handed shooters benefit from a
little castoff and most custom built guns are made this way. The only question is how
much. The castoff of a gun is about right when, with the gun comfortably mounted, the
front bead lines up with the center of the standing breech.
A stock offset to the left, for shooting from the left shoulder is said to be
An inexact, non-technical term indicating a magazine holding more rounds than might be considered "average.".
A type of cartridge whose bullet diameter is substantially less than the body diameter of the casing.
A rifle front sight with a extra-large, folding bead. Typically, in addition to the normal fine bead (which allows for more precision) the larger bead,
while at a cost of potential accuracy, is more readily acquired in marginal light. Also called a Gloaming sight
A fouling shot is a shot fired through a clean bore, intended to leave some residue of firing and prepare the bore for more consistent performance in subsequent shots.
The first shot through a clean bore will behave differently from subsequent shots through a bore with traces of powder residue, resulting in a different point of impact.
A malfunction which locks up the gun so badly that tools are required in order to fix it. Sometimes used to denote a simple malfunction,
but many people make a distinction between a complete jam and a simple malfunction.
Slang for hearing protection. Applies to either muffs or plugs.
A semi-automatic firearm malfunction in which the slide passes entirely over the fresh round, failing to pick it up to insert into the chamber as the slide returns to battery.
A cartridge in which the base diameter is the same as the body diameter. The casing will normally have an extraction groove machined around it near the base,
creating a "rim" at the base that is the same diameter as the body diameter.
Abbreviation for Center Of Mass.
A safety lever or button found on the outer surfaces of the firearm and is accessible to the user. Enabling the external safety should prevent accidental pulling of the trigger. However, the best safety is always you.
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