DarkRP + Mad Cows ammo

[einjoh]

Hey there. Can anyone tell me how to add Mad Cows ammo onto the F4 menu?
This is the code line im using in addentities.lua atm:

AddCustomShipment("357 Ammo","models/weapons/w_pist_fiveseven.mdl", "ent_mad_ammo_357", 300, 10, true, 40, false, {TEAM_GUN})

But as you probably can see, this spawns a fiveseven model. It works great, i get the ammo when i hit E on the fiveseven. But what models should i use for the different ammo types?

Thanks :)