If a bullet is incorrectly inserted into the mouth of a case, it may deform the case mouth rearward, downward, causing a defect. Also known as a Tear-Down.
Archives: Glossary
Glossary custom post type
LIVE AMMUNITION
A metallic cartridge or shotshell that is complete and ready to use.
LOAD
1. The combination of components used to assemble a cartridge or shotshell. 2. The act of putting ammunition into a firearm.
LOADING BLOCK
A device containing a number of blind holes into which cases or completed ammunition are placed.
IRON SIGHT
Any sight, front or rear, not containing optical magnifying elements. It may be fixed or adjustable. Also called Metallic Sight.
JAM
A malfunction of a firearm that prevents the action from operating; may be caused by faulty parts, ammunition, improper maintenance or improper use of the firearm.
JANKA HARDNESS, JANKA TEST
A system of rating the hardness of wood by use of a 0.444 inch diameter ball; measured in pounds required to force one half the diameter of the ball into the wood.
JIG
A precise mechanical locating device used in production of component parts and/or assembly of firearms.
JOINT
A place where two or more parts come together so as to permit motion. The term is sometimes used in reference to the pivot point of a hinged action.
JUG CHOKE
A type of shotgun barrel choke, wherein a slight recess is formed in the bore approximately one inch behind the muzzle. The recess causes the shot to gather before leaving the muzzle resulting in a denser pattern.