code/__DEFINES/~skyrat_defines/projectiles.dm

CALIBER_223S	The caliber used by the Oldarms 'Mk.11.4 rifle', designed to be worse .223.
CALIBER_60STRELA	Caliber used by the giant anti materiel rifle in guncargo
CALIBER_CESARZOWA	CIN pistol caliber
CALIBER_SOL40LONG	Standard Sol rifle caliber
CALIBER_SOL35SHORT	Standard Sol pistol caliber
CALIBER_980TYDHOUER	Basically 20mm grenades, I'd be concerned if a grenade launcher didn't use this
CALIBER_585TRAPPISTE	Large caliber pistol round for Sol hand cannons
CALIBER_PEPPERBALL	Caliber used by the pepperball gun
CALIBER_460ROWLAND	Used by the Rowland Magnum Pistol

Define Details

The caliber used by the Oldarms 'Mk.11.4 rifle', designed to be worse .223.

Used by the Rowland Magnum Pistol

Large caliber pistol round for Sol hand cannons

Caliber used by the giant anti materiel rifle in guncargo

Basically 20mm grenades, I'd be concerned if a grenade launcher didn't use this

CIN pistol caliber

Caliber used by the pepperball gun

Standard Sol pistol caliber

Standard Sol rifle caliber