Wild Bill's sidearm has one of the highest item HPs among pistols and it fires very fast outside of V.A.T.S., about as fast as you can tap the fire button. Because of this, it remains a relatively decent sidearm far into the game despite its low damage. It can be repaired with other .32 pistols.
The sidearm can fire 830 rounds before breaking. That's 166 cylinders, 56 more than the regular .32 pistol.