I'll add on the C4, you need two things to ignite it, heat and pressure. A muzzle loading rifle would provide the spark from its striker, but not any pressure using the C4 as a powder alone (if that's what you're meaning).
Now if you use black powder as a starter, it would provide enough of both to ignite the C4, at which point, it's going to burn at 28,800+ fps, which is going to seriously damage your chamber, barrel, and most likely your upper torso and head.
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