Ammo loadouts

[Krt_Bong]

I would like to know if you create a custom loadout how the menu works.
For example, I have to build a loadout for each individual gun, and I give each gun a load of Tracer, Armor Piercing, Incendiary, Ball, Tracer. Lets say that each gun holds 100 rounds, Is my loadout 20 rounds a piece of each type consecutively or 1 round of each in a repeating pattern? Is there an easy way to set all guns up without having to do each one individually?