Ok just cam up with a wild Idea. Orks think that if ya paint something a certain color it will have different effects. What happens when we take that concept and apply it to ammo. Here are my thoughts
Red. Red onez iz fasta. Weapon range increased by 25% round up
Blue. Da Blue onez iz Lucky. Damage increased by +1/+2/+3 for Common, Good, and Best Craftmanship
Black. Black iz Ded Killiy. Rightous Fury happens on a 9 or a 10
Yellow. Da Yella onez iz right flash! When trading to other Orks gain +10 on Barter
Green. GREEN IZ BEST! Add any bonus with a +5 to BS
So what ya think?