[GTA SA] How can i create a mod that adds damage dropoff for weapons?

[ro4st]

I'm trying to make a realistic modpack for SA with a bunch of custom weapons and i'd like to create a mod that simulates damage loss over range for weapons, but i really don't know how.

 

I'll take the normal pistol as an example:

At a range from 0 to 10 = 25 damage

- from 10 to 20 = 23 damage

- from 20 to 30 = 21 damage

 

This mechanic exists in GTA V and a lot of shooters, so i think it would be nice for SA, but... Is it possible to make a mod like this?