______________ and _____________ are the only types of powder that may be used in most muzzleloaders.

In muzzleloaders, the only types of powder that are typically used are black powder and smokeless powder. Black powder has been used for centuries in various firearms, including muzzleloaders, due to its ability to produce a significant amount of gas and pressure when ignited, which effectively propels the projectile. Smokeless powder, while more modern, is also suitable for use in some muzzleloaders, assuming the firearm is designed to handle it safely.

It’s important to emphasize that using the incorrect type of powder can lead to malfunctions or safety hazards. Black powder is explicitly designed for muzzleloader use, while smokeless powder can provide higher energy and burning rates but must be used only in muzzleloaders that are rated for it.

Other options present various combinations that either do not include smokeless powder, which is permissible in some modern muzzleloaders, or suggest materials that do not exist or are not suitable for this application. Understanding the specific requirements for powder type in muzzleloaders ensures proper and safe operation.