Smokeless powder and muzzleloaders don't go together. Here's why.
You definitely do not want to use modern-day smokeless powder in blackpowder firearms and this video proves that point resoundingly. Smokeless powder, the type used for instance in shotgun shells and rifle rounds, should not be used in a muzzleloading firearm that is not specifically made to shoot such powders.
Here's a video that purports to be one man firing a blackpowder muzzleloader that was loaded by his cousin. It's just that the cousin loaded the firearm with an unknown brand of smokeless powder.
The result you see will be the devastating, heinous possibility that can occur when the wrong type of powder is used in the wrong type of firearm.
This fellow was amazingly lucky.
Warning: graphic language used in the video.
It's hard to believe that young man walked away with just a scare. Based on his body language, he hasn't fired too many guns before, but then again we all had to start somewhere.
These fellows would have been better off after a good lesson down at the range.
Blackpowder, sometimes referred to as the original gunpowder, is composed of charcoal, saltpeter, and sulfur. Today's gunpowder is more refined and generally smokeless, and is described as being more of an explosive in a muzzleloading firearm.
The bottom line is that black powder is the only type of powder that should be used in muzzleloaders, with synthetic substitutes, such as Pyrodex being used as well.