SIG SAUER P938P - Manual (Page 17)

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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.