Sometimes when playing I will go ages without finding a green ammo drop and then sometimes I get far more than I need dropping at the same time. Are ammo drops completely random or are they influenced by actions you take?
For example does what weapon type you use influence what ammo drops? Do precision kills make a difference? Does doing lots of damage in a short time make a difference? These are all things that I have sometimes anecdotally thought make a difference but its always hard to tell the difference between that and RNG…
And as a last addendum do you have to have even done damage for something for it to drop ammo for you (eg if your fireteam kill it without you)…
Best Answer
I'll convert my comment to an answer as it was getting long.
I get the feeling playing the game that precision kills drop more ammo, but have no evidence.
Do be aware some guns have the 'surplus' attribute which means more ammo will be found for that weapon slot.
Thanks to @Havatra for the thought. There might indeed be Grimoire cards for this. Here is an example of an area bonus earned through killing enemies in that area. So far I have seen bonuses to,
EXP,Weapon EXPandMaterials, but I don't have a huge Grimoire score and http://destiny-grimoire.info/ doesn't have the card bonuses listed.