SIG SAUER P320 - Manual (Page 16)

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6. if there is any reason to suspect that a bullet is obstructing the barrel,
immediately unload the firearm and look through the bore. it is not sufficient to
merely look in the chamber.
a bullet may be lodged some distance down the barrel where it cannot easily be
seen.
waRning – lodged bullet
if a BulleT iS in THe Bore, do noT aTTeMPT To SHooT iT ouT By uSing
anoTHer carTridge or By BloWing iT ouT WiTH a BlanK or one froM WHicH
THe BulleT HaS Been reMoVed. SucH TecHniQueS can generaTe eXceSSiVe
PreSSure, daMage THe firearM, and cauSe SeriouS PerSonal inJury.
if the bullet can be removed with a cleaning rod, clean any unburned powder
grains from the bore, chamber, and mechanism before resuming shooting. if the
bullet cannot be dislodged by tapping it with a cleaning rod, send the firearm to
Sig Sauer.
7. dirt, corrosion, or other foreign matter on a cartridge can impede complete
chambering and may cause the cartridge case to burst upon firing. The same is
true of cartridges that are damaged or deformed.
8. do not oil cartridges, and be sure to wipe the chamber clean of any oil or
preservative before commencing to shoot. oil interferes with the friction between
cartridge case and chamber wall that is necessary for safe functioning, and
subjects the firearm to stress similar to that imposed by excessive pressure.
9. use lubricants sparingly on the moving parts of your firearm. avoid
excessive spraying of any aerosol gun care product, especially where it may
get on ammunition. all lubricants and aerosol spray lubricants, in particular,
can penetrate cartridge primers and cause misfires. Some highly penetrative
lubricants can also migrate inside cartridge cases and cause deterioration of the
propellant powder; on firing, the powder may not ignite. if only the primer ignites,
there is danger that the bullet may become lodged in the barrel.