Here you go stupid, it is a round and type of rifle, read:
308 rifle
A .308 rifle is a firearm chambered to fire the .308 Winchester cartridge, a popular rimless, bottlenecked rifle cartridge developed by Winchester in 1952.
This cartridge is widely used for hunting medium- to large-sized game, target shooting, law enforcement, military sniping, and personal protection.
The .308 Winchester is similar to the 7.62×51mm NATO cartridge, which was standardized by NATO in 1954, but the two are not identical and have different pressure and chamber specifications.
The .308 Winchester is available in a wide variety of rifle actions, including bolt-action, semi-automatic (such as AR-10, M1A, FAL, and HK 91 patterns), and break-barrel designs.
Bolt-action rifles like the Remington 700, Savage Model 110, Ruger American, Tikka T3 CTR, and CZ 600 Lux are frequently recommended for hunting and target shooting due to their accuracy and reliability.
The Remington 700 is often considered the standard for .308 rifles, particularly in the bolt-action category, and its design has influenced the parts ecosystem for many custom rifles.