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 :)
it was fast
the highest speed a bullet can reach is 1500m/s
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
a similie ;)
360 mph
really fast
smile
as fast as chuck norris' fist duhhh
Faster than a speeding bullet.