Express, in terms of weaponry, refers to a type of ammunition that is designed to be fired from a shotgun. Shotguns are firearms that use shells, also called cartridges, to shoot pellets or shot as well as slugs or single projectiles. The term "express" originally came from British hunting where it meant a shotgun cartridge that was loaded with a large amount of gunpowder and a heavy projectile, allowing the gun to fire at high speeds.
Express shotgun shells are typically larger than regular shotgun shells and have a higher amount of gunpowder. This means that when they are fired, they produce a more powerful and forceful blast, allowing them to travel at greater speeds and with greater impact on their target. This makes them ideal for hunting large game such as deer, ducks, and geese.
Express cartridges can also have different types of projectiles depending on the intended use. For example, some are loaded with larger pellets for hunting larger game, while others are loaded with slugs for shooting at longer ranges or penetrating thick cover. Regardless of the specific type of ammo, express shells are designed to deliver maximum power and accuracy to the shooter.
In summary, express refers to a type of ammunition that is designed specifically for shotguns and is loaded with more gunpowder than a regular shotgun shell. This makes it more powerful and able to shoot at higher speeds for hunting large game.