well i trying to find some values for Counter Strike and i made them work in lan-mode
here is a way to find and lock the ammo number and make it to stay that way.
1st get the weapon that you wanna use
2nd look whats the number of the ammo and do a data search of that number
3rd waste some bullets and use the reload to spend some of the ammo
4th look at the number of the ammo bullets again and do a sub search
5th do the same thing again by wasting ammos and searching till you find few values ( they may be a lot of them just take the 1st one)
6th lock the value to the max number of ammo the weapon can have and try it out