@Lord_Scorpion34 I have done it before in multiple matches. You just dump the ammo you have and start taking it all. When it's on drop it's not that difficult to swipe all the ammo in a given area.
Some areas it's easier to take all the ammo and hide than other areas. An example of a location I've done it is docks and fight night.
It's really effective when you do it to people who have already been fighting. Just start swiping ammo and batteries from the death boxes. You might not get it all. But if they are running a 99 and you can swipe most of the light ammo, there is a good chance they will be extremely low on light ammo. I carry 300 rounds for my 99, I can easily burn through all of that in a 3-4 squad fight. If I only have 100 rounds or so going into a fight and I can't 1 clip everyone there is a good chance I'll run out of ammo.