# Magic Quiver + Phantasm + Vortex Breastplate = 111% chance of not consume ammo, still consumes ammo

#### Threule

##### Terrarian
Is there something I need to know about ammo consumption % ?
They dont stack?
Something is bugged?

Ammo consumption is not, as you might think, something that stacks. I think that it starts by multiplying 1 by the bonus stacks, which makes the maximum chance to not consume ammo around 79%.

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It doesn't work that way.

Say you have 3 items which lower ammo consumption. (I am making up items and numbers, doesn't matter for the example.)
- Endless bullet pouch: 25% less ammo consumption.
- Everlasting pants: 25% less ammo consumption.
- Machine gun: 50% less ammo consumption.

Total: 100%.
But not really.

For every bullet you fire one of these items gives the chance to not use a bullet.

Say I fire a bullet.
- Endless bullet pouch does a roll, roll fails and the bullet is spend. Or it were, but you have more items with this bonus.
- Still the same bullet but now the Everlasting pants makes a roll. Roll fails.
- Now the Machine gun does a roll. Roll succeeds and the bullet is not spend.

This dice rolling happens every time you fire a bullet and have a less ammo consumption bonus.
You'll never have 100% free bullets. But with more and more items like these you get more and more rolls of the dice to not waste your bullets.

Hope that makes sense. Anyone do correct me if I'm wrong.

How it is calculated, then?

EDIT: Nvm, upper post appeared while I was writing, thanks

i think this is how its calculated
phantasm- 66% chance....34% chance to consume
breastplate- 25% chance..75% chance to consume
quiver 20% chance.........80% chance to consume

multiply them-.204 chance to consume
79.6% chance not to consume ammo

i think this is how its calculated
phantasm- 66% chance....34% chance to consume
breastplate- 25% chance..75% chance to consume
quiver 20% chance.........80% chance to consume

multiply them-.204 chance to consume
79.6% chance not to consume ammo
So it's calculated from the chances of consuming?

So it's calculated from the chances of consuming?
Yes, that's also how dota 2 calculate cleave percentage with the battle fury (lol)