Heres a copy of a simple cheat table, I made in Cheat engine.
It has all the static base addresses for the ammo decreaser from your magazine on all weapons. There may be some addies with ???? next to them the incrementer seems to juggle in the set of bases. Dont delete the ??? ones you may need them next time you start the game.
If it dont work sorry I was just trying to be nice
To use this you need CE installed just double click the file and target dxhr.exe in the process chooser. Put a x in the box next to the addies without ??? next to them.