Is there a resident evil 4 unlimited ammo cheat

To do this, you need at least one normal weapon, and the Infinite Rocket Launcer.
At the begining of each chapter hit an enemy with any weapon once (any weapon other than the IRL) You can then fire away at anything with the Rocket Lancher, no matter if you hit or miss an enemy, and you will get 100% hit rate at the end of the chapter.
This happens because the game does not register the Rocket Launcher hits like the other weapons hits.