Excessive pressure in the barrel when a shot is fired can blow up even the strongest firearm, and cause death or serious injury to the shooter or others nearby.
Even at normal firing pressure (often in excess of 50,000 pounds per square inch), if the cartridge case bursts the uncontrolled escape of propellant gas from the barrel into the receiver area can be extremely dangerous. Explosions from excessive pressure or burst cartridge cases are most commonly caused by defective or improper ammunition or by an obstruction in the barrel. (See warnings in following section, "Bore Obstructions".)
Defective cartridges may be overloaded or underloaded, incorrectly dimensioned, improperly manufactured or assembled, or assembled from the wrong or faulty components. Defective ammunition also includes cartridges that are dirty, wet, corroded, bent, split, damaged, contaminated with lubricant, or deteriorated from age or poor storage. Corrosion, dirt or other foreign matter on a cartridge can impede complete locking of the bolt, and in combination with other faults may result in a burst cartridge case; the same is true of a cartridge that is oversized, damaged or deformed. Another defect is a bullet that is loose in the case neck; this condition introduces a high risk of a bore obstruction.
Improper cartridges are those of the wrong caliber or loading for normal use in a particular firearm.
FOR SAFETY, USE ONLY CLEAN, DRY, HIGH QUALITY AMMUNITION IN GOOD CONDITION MANUFACTURED AND ASSEMBLED TO INDUSTRY STANDARDS BY REPUTABLE MANUFACTURERS, AND OF THE CORRECT CALIBER AND LOADING FOR YOUR FIREARM.
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