What is often used with round lead balls in traditional muzzleloading?

In traditional muzzleloading, the correct answer is the patch, which plays an essential role when using round lead balls. A patch is a small piece of fabric that is placed between the round lead ball and the barrel's rifling. Its primary function is to create a tight seal within the barrel, preventing gas from escaping around the ball when the gun is fired. This seal improves the efficiency of the shot by maximizing the pressure of the expanding gases behind the projectile, contributing to better accuracy and velocity.

Moreover, the patch also serves a lubricating function. When greased with a substance such as beeswax or lubricant, it reduces friction as the ball is forced down the barrel, making it easier to load and minimizing wear on the barrel’s interior. This practice is rooted in muzzleloading traditions and is critical for both performance and maintenance of the firearm.

In contrast, the other options generally do not pertain to traditional muzzleloading with round lead balls. Plastic cartridges and sabots are more commonly associated with modern ammunition and specific types of muzzleloading firearms, while a greased wad is typically utilized in different loading practices or types of firearms. The combination of a round lead ball and patch is a hallmark of traditional muzzleloading techniques.