Overheating & ammo - an interesting discovery

[safoolfool]

That sounds really cool, and I wouldn't be surprised if it was modeled in game. That said, your test isn't conclusive. If each ammo had a random range of heat/dirt generation, it could just be that the RNG made the first burst dirtier than the second, not the ammo. If I were you I would do maybe 3 tests with each type of ammo, recording the same info, and see what the results were then. Also, instead of repairing and waiting, you could just reload the game.