SIG SAUER P250 - Manual (Page 15)

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3. firearms may be severely damaged and serious injury to the shooter or to others may
result from any condition causing excessive pressure inside the chamber or barrel during
firing. excessive pressure can be caused by obstructions in the barrel, propellant powder
overloads, the use of incorrect cartridges, or defectively assembled cartridges. in addition,
the use of a dirty, corroded, or damaged cartridge can lead to a burst cartridge case and
consequent damage to the firearm and personal injury from the sudden escape of high-
pressure propellant gas within the firearm’s mechanism.
4. immediately stop shooting and check the barrel for a possible obstruction whenever:
• you have difficulty in, or feel unusual resistance in, chambering a cartridge
• a cartridge misfires (does not go off)
• The mechanism fails to extract a fired cartridge case
• unburned grains of propellant powder are discovered spilled in the mechanism
• a shot sounds weak or abnormal. in such cases it is possible that a bullet is lodged
partway down the barrel. firing a subsequent bullet into the obstructed barrel can
wreck the firearm and cause serious injury to the shooter or to bystanders
5. Bullets can become lodged in the barrel:
• if the cartridge has been improperly loaded without propellant powder, or if the powder
fails to ignite (ignition of the cartridge primer alone will push the bullet out of the
cartridge case, but usually does not generate sufficient energy to expel the bullet
completely from the barrel).
• if the bullet is not properly seated in the cartridge case. When such a cartridge is
extracted from the chamber without being fired, the bullet may be left behind in the
bore at the point where the rifling begins. Subsequent chambering of another cartridge
may push the first bullet further into the bore.