1911austin
New member
Does anyone know about how far a supersonic bullet travels before creating the “supersonic crack”? I was shooting a suppressed 5.56 last weekend. We shot in into a sand trap from only a few feet away and there was no crack. Shooting at about 100 yards there was a crack. I realize the bullet design and velocity will determine how long it will take to get a pressure wave setup and to break the sound barrier. I’m just looking for some sort of “rule of thumb” for what I should expect. Basically, at CQB distances within a house, what are the odds of getting the sonic boom?