You don't even need to pull in damage numbers for the math. Let's assume no ammo perks, so 18 rounds (if not Eirene), now let's assume a reduction of just 5 (so obviously not 1kys).
5/18 = 0.2777...
So a reduction of potential damage of at least 27.8 % without any ammo perks.
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I was hoping to illustrate numbers for effect
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The important number is overall damage reduction in reserves though, and you get that without any fictive damage numbers. That's all I wanted to point out ;)