The rule of three is just that, 3 clips of ammo for each gun you carry, barring heavy weapons that use the special ammo packs, and other normally hard to come by ammo like plasma, It also doesn't usually include the special issue bolt ammo, but that is GM's choice.<br/><br/>But things like, melta or flamer canisters, bolt weapon clips. 3 clips including what you have in your gun