What kind of powder can cause serious injury if used in a muzzleloader?

Using modern smokeless powder in a muzzleloader can lead to serious injury because smokeless powder is not designed for that type of firearm. Muzzleloaders operate on a different principle than modern cartridge firearms and are specifically calibrated for black powder or black powder substitutes like Pyrodex. Smokeless powder can generate pressures far beyond what a muzzleloader can handle, and as a result, it can cause catastrophic failure of the firearm, leading to potentially severe injuries to the shooter and bystanders.

In contrast, the other options, such as black powder and Pyrodex, are explicitly formulated for use in muzzleloading firearms, with considerations for the pressures and burn rates relevant to their operation. Clear Shot is also a black powder substitute designed to be safe for use in muzzleloaders, further emphasizing why smokeless powder is distinctly hazardous in this context. Understanding the appropriate propellant for muzzleloaders is crucial for safe shooting practices.