I have been shot at (towards) a bunch with .30-06 class rifles from several hundred yards. I assume the projectiles were still supersonic. What I would hear was an eerie loud sucking sound, a sonic crack, and then the muzzle report. I would assume that I would have heard nothing had I taken a hit. The muzzle report arrived noticeably after the first crack.

Patriotism (and religion) is the last refuge of a scoundrel.
Jesus: "Take heed that no man deceive you."
Hebrew Roots Judaizer