A rifled musket is a type of firearm that features spiral grooves cut into the barrel, which imparts a spin to the bullet as it is fired. This design improves accuracy and range compared to smoothbore muskets. The most famous example is the Springfield Model 1861, widely used during the American Civil War. Rifled muskets typically use a conical bullet, such as the Minie ball, which expands upon firing to create a tight seal in the barrel. This allows for greater muzzle velocity and effective performance at longer distances, making rifled muskets a significant advancement in military technology during the 19th century.