Health is a little buggy you have to be player one to get unlimited HP.
Unlimited Ammo will not work with explosive impact.
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How to use
Go to into sandbox and shoot a few times then enable ammo.
For unlimited health go into sandbox and spawn Demonic Pact shoot a few times then enable health.
How to use this cheat table?
Install Cheat Engine
Double-click the .CT file in order to open it.
Click the PC icon in Cheat Engine in order to select the game process.
Keep the list.
Activate the trainer options by checking boxes or setting values from 0 to 1