Depends on the bullet, the cartridge and the weapon that fired it, see related link.
Some examples:
rilly fast
as fast as waliur and leyla (love)
It sold out as fast as a speding bullet :)
the highest speed a bullet can reach is 1500m/s
it was fast
because the recoil is when the bullet forces the gun back and so the bullet creates the recoil and so it can't make it go just as fast
360 mph
a similie ;)
really fast
smile
as fast as chuck norris' fist duhhh
Faster than a speeding bullet.