magnum (cartridge, gun)
Refers to a type of high-powered firearm cartridge or the gun itself. Often used in compound terms like マグナム弾 (magnum round) or マグナムリボルバー (magnum revolver).
He prefers handguns that use magnum rounds.
magnum (1.5-litre wine bottle)
A large wine bottle holding 1.5 litres, equivalent to two standard bottles. Common in wine shops and restaurants.
I bought a magnum bottle of wine for the party.
The detective fired his magnum and cornered the criminal.
At the wedding, they toasted with a magnum of wine.