The penalties if you are caught with a single live bullet can range from 6 to 8 years imprisonment or up to 10 to 12 years, depending on the type of ammunition according to the PNP Aviation Security Group.
A live ammunition refers to a complete unfixed unit consisting of a bullet, gunpowder, cartridge case, and a primer or loaded shell for use in any firearm. For example a single 22-caliber bullet, can be considered dangerous because it can be fired using pliers or even a hammer. Source
Bail for this can cost a Filipino P80,000 or P120,000 for foreigners.