Chart of Unsafe Firearms and Ammunition Combinations
R - 102 matching terms
RADIAL PRESSURE GAGE
See Gage, Radial Pressure.
One method used to measure ammunition and/or firearm accuracy capability. To determine the mean radius, the center of the group is located, and the distance to the center of each shot from the group center is measured and recorded. The sum of these measurements divided by the number of shots is the mean radius.
The curved surface between the neck and the shoulder of a cartridge case.
The curved surface between the body and the shoulder of a cartridge case.
See Sight, Ramp.
See Cartridge Ramp.
A platform or cut placed in the bottom of the receiver that aids in guiding a cartridge into the chamber as the action is closed.
A sight base having a sloping rear surface.
A rod used in seating a load in muzzle-loading firearms.
1. An area equipped for testing firearms and ammunition.2. The horizontal distance between the firearm and the target.
The maximum distance at which a projectile can be expected to be useful.
The greatest distance a projectile can travel when fired at the optimum angle of elevation of the gun barrel.
A notched wheel on the rear of a revolver cylinder which causes the cylinder to rotate when so urged by a lever called a Hand or Pawl.
RATE OF TWIST
The distance required for the rifling to complete one revolution.
See Sight, Rear.
The replacing of a barrel with another barrel.
See Cartridge, Rebated.
See Hammer, Rebound.
See Slide, Rebound.
See Lock, Rebounding.
The basic unit of a firearm which houses the firing and breech mechanism and to which the barrel and stock are assembled. In revolvers, pistols, and break-open guns, it is called the Frame.
That part of the receiver on bolt action rifles that arches over the rear of the bolt hole. If cut to allow the passage of the bolt handle it is known as a Split Bridge.
The front part of the receiver on bolt action rifles into which the barrel is fitted.
See Sight, Receiver.
A heavy duty mechanical device into which chambered barrels are secured for testing ammunition.
The cutting of a new chamber in a barrel to accommodate a cartridge of the same bore diameter.
The rearward movement of a firearm resulting from firing a cartridge or shotshell. Sometimes informally called “Kick”.
See Absorber, Recoil.
See Lug, Recoil.
An automatic or semiautomatic type firearm in which the force of recoil is used to unlock the breech bolt and then to complete the cycle of extracting, ejecting and reloading.
A butt plate, usually of rubber, to reduce the sensible recoil of shoulder firearms.
A device for measuring Free Recoil Energy in which a firearm is suspended from fixed points so as to allow it to swing freely while the barrel remains horizontal.
1. Steel insert in the frame of a revolver immediately surrounding the firing-pin hole; also called Firing-Pin Bushing.2. See Lug, Recoil.
On a revolver, a lateral extension of the standing breech, to each side, to prevent fired or unfired cartridges from coming out of the chambers and to protect the otherwise exposed primers of unfired cartridges.
See Lug, Recoil.
The spring which returns a semiautomatic firearm to battery.
See Charge, Reduced.
See Ammunition, Reference.
The adjusting of the relationship of the axes of multi-barreled firearms so as to make the points of impact coincide.
The carving of raised scenes that produces three-dimensional figures.
The process of manually reassembling a fired cartridge case with a new primer, propellant and bullet or wads and shot. Also called Handloading.
Primers, propellant powder, bullets, or shot and wads, used with fired cases to load ammunition.
A description of recommended relationships of reloading components.
Tools which hold and/or reform cartridge cases or shotshells during a reloading operation.
See Powders, Reloading.
See Velocity, Remaining.
Any firearm equipped with a magazine that holds more than one shot without reloading.
See Pressure, Residual.
RESIZING, FULL LENGTH
The operation of reforming a fired cartridge case to approximately its original dimensions.
A device to support a firearm during firing.
REST, MANN “V”
A type of machine rest that was designed by Dr. Franklin W. Mann. Commonly called a V Block. A heavy Mann barrel suitably chambered for the cartridge to be tested in used with the rest.
An adjustable support for a target rifle extending downward from the forearm.
The replacement of one stock with another.
The aiming reference seen when looking through a telescopic sight.
Alternate term for Operating Spring, Closing Spring, Recoil Spring.
Part used to move a breech bolt to rear.
A firearm, usually a handgun, with a cylinder having several chambers so arranged as to rotate around an axis and be discharged successively by the same firing mechanism through a common barrel.
REVOLVER, DOUBLE ACTION
A type of revolver in which the rotation of the cylinder, cocking and firing are performed by a single pull of the trigger. Most Double Action revolvers can also be fired in the single action mode by manually cocking the hammer.
REVOLVER, SINGLE ACTION
A type of revolver in which the hammer must be cocked manually to rotate the cylinder for each shot. The firearm is then discharged by a pull of the trigger The process is repeated for each shot
A raised surface used as a sighting plane. Ribs may be either solid or ventilated. See Rib, Ventilated.
The protrusion of a rib beyond the breech end of a barrel.
A solid raised surface above a barrel or barrels which functions as a sighting plane.
A raised sighting surface which is separated from the barrel by means of posts that allow air to circulate around it. Its purpose is to minimize heat waves in the line of sight. Also called Bridge Rib.
The glancing rebound of a projectile after impact.
A firearm having spiral grooves in the bore and designed to be fired from the shoulder.
A fully automatic shoulder firearm that starts firing when the trigger is pulled and continues until the trigger is released or ammunition is exhausted. The term should not be used in conjunction with semiautomatic firearms.
A rifle designed for optimum accuracy while being shot from the shoulder and supported by a specifically designed table (rest).
1. Originally, the term was used in reference to long-barreled flintlock rifles.2. The name given one type of a caliber 22 rimfire cartridge.
A sporting rifle with a heavy barrel, designed for long range small game hunting, firing high velocity, flat trajectory projectiles.
See Slug, Rifled.
Grooves formed in the bore of firearm barrel to impart rotary motion to a projectile.
A tool having a series of cutting edges of slightly increasing height used to cut the spiral grooves in a rifle barrel.
That part of the hook or cut rifling tooling that holds the cutter and the mechanism for deepening the cut as the operation progresses.
The distance the projectile must move along a rifled bore to make one revolution. Usually expressed as “one turn in x inches (or millimeters).”
A process wherein a hardened steel disc or button with a rifling cross section configuration is pushed or pulled through a drilled and reamed barrel so as to cold form the rifling grooves to the desired depth and twist.
A process of forming the spiral grooves in the bore of a rifle barrel by a cutting tool which has a hook shape. Also called Hook Rifling.
See Rifling, Swaged.
The formation of the spiral grooves in the bore of a rifle barrel by means of an internal mandrel and external hammers. Sometimes called “Hammer Foreged Rifling”.
The flanged portion of the head of a rimfire cartridge, certain types of centerfire rifle and revolver cartridges and shotshells. The flanged portion is usually larger in diameter than the cartridge or shotshell body diameter and provides a projecting lip for the firearm extractor to engage so that the cartridge or shotshell may be extracted from the chamber after firing. In a rimfire cartridge the rim provides a cavity into which the priming mixture is charged.
A counterbore in the rear end of a chamber or bolt face to support the head of a rimmed cartridge.
A radial rupture of the head and rim of a rimfire cartridge or shotshell.
RIM, SPLIT (RIM-SPLIT)
A circumferential rupture of the rim of a rimfire cartridge or shotshell.
See Cartridge, Rimfire.
See Cartridge, Rimless.
See Cartridge, Rimmed.
See Barrel, Ringed.
See Barrel, Ringed.
See Gun, Riot.
A British term for the wrinkled appearance of some shotgun bores.
See Ejector, Rod.
See Crimp, Rolled.
See Action, Rolling Block.
See Magazine, Rotary.
See Projectile Rotation.
One complete small arms cartridge.
ROUND BALL PROJECTILE
See Projectile, Round Ball.
See Butt, Round.
ROUND NOSE BULLET
See Bullet, Round Nose.
A malfunctioning automatic firearm that fires multiple shots after trigger pressure is released..
See Checkering, Runover.
Checkering or engraving lines that go beyond the border.
A generally circumferential separation in the side wall of a cartridge case. May be complete or partial.
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