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Yeaa that's the default behaviour of the game. It's annoying and a bit tricky to modify. It technically defaults to the "best" available ammo. I might look into adjusting it though. 

And no worries, hope you enjoyed the game! 

I guess it's a good way to make me use the "good" ammo.  Otherwise, I'll save the good ammo until I really need it and I'll never use it.