It can be either. Some weapons fire sub-sonic ammunition, some super-sonic.
4000 fps +
as fast as chuck norris' fist duhhh
because the atoms in solid are compact it helps sound to travel fast
@ 2000 FPS
Between 800 and over 4,000, depending on which bullet you had in mind.
Sound cannot travel through a vacuum.
@890 mps
Oxygen
no from what i have learned light travels faster then sound
in air sound travels 330m/s
Sound waves cannot travel in a vacuum.
Solids