This is a list of firearm cartridges which have bullets that are to in caliber.
The most famous military cartridge in the 14 mm caliber span is probably the Soviet/Russian 14.5×114mm cartridge, initially developed for various anti-tank rifles before WWII, and later on re-adopted as a heavy machine gun cartridge which continues to see widespread use in the 21st century.
Cartridges.
All measurements are in mm (in).