[OUTDATED]
RAMAKE IS AT:
https://www.gtainside.com/gta4/mods/165036-no-ammo-limit-for-original-weapons-mod-fix-for-standard-gtaiv-tbogt-tlad-remake/

This mod/fix removes the ammo limit from the original weopons in gta4. I know that the ammo limit is gone after completing the game with 100%, but when you save and reload, the ammo is back at the max limit. For example: You buy 100 rockets, save and when you reload, they are back again at 8 rockets. This mod sets the max ammo limit for all weapons at 9999 and fixes the bug after reloading the game!

To install this mod/ fix, you have to take the file named WeaponInfo and have to replace the normal WeaponInfo which is stored in:
/GTAIV/common/data

There is also a tutorial in the ReadMe file.

(This is my first mod.)