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Use of weapon removes (or adds) number to Ammo Value.
Running a lot of modern games, I notice that these games don't have a function in the character sheet to subtract ammo when a player shoots their gun. Where would I begin to make such a macro? or does this question belong in another forum?
The reason a lot of sheets lack such a feature is because you cant do this with macros. Macros can only read values from a sheet, they cant change them. However, since you're a Pro user, if you're the GM, you have access to API scripts, and the ammo and chatSetAttr scripts can both do what you need. Check them out.