Thread: Reloading and sonic crack questions

I'm pretty sure the crack won't get louder the faster its going, size of the projectile would effect it as it would be making as the shockwave size would be dependant on projectile size.

However the muzzle blast may be bigger because more powder was used.

And if it exited the barrel at just over the speed of sound then the it would only make the crack for the first part of its flight. But then it becomes unstable when passing back through the sound barrier.

Does any of that make sense, it barely does to me and it's just my yr13 (7th form) physics im leaning on.