I made a mod that simply removes casings from being ingredients in all ammo recipes and from being in the output of all breakdown recipes.

The recipes in-game remain unchanged.

I thought it was maybe because I had NV and Old World Blues master files selected when I made the mod so I remade it having only selected the NV master file and the recipes in-game remain unchanged.

I tried with old saves and with a fresh new game and no effect.

And I did make sure the file was selected in the data list. I'm been a successful mod maker since Morrowind, I just don't get what's happening.