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Gun powder is an explosive. It has a low brisance, meaning it is not comsumed as fast. The wave produced is subsonic. What you are talking about is a high explosive with a fast brisance and a supersonic blast wave. That will not be contained in a firearm. I believe the shock wave of the detonation will destroy any firearm
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Gun powder is technically not an explosive, and the shockwave produced by contained gunpowder is far beyond supersonic. It has to be, otherwise the bullet would not/could not be.
That said, C4 and other true "explosives" burn MUCH MUCH faster than gunpowder.... the bullet would not have time to start moving and the pressure would build "instantly" to catastrophic levels. The gun would explode, exactly like it does with gunpowder and a blocked barrel. The reason that gunpowder does not normally blow up a gun is because it's relatively slow burn rate allows for the bullet to begin moving ahead of the expanding gases, keeping pressure at safe(r) levels.