Chaos Bullets will continue attempting to stack bounces and pierces onto a bullet until it fails, or reaches 10 bouncing/piercing. This means that a projectile that already gained a bounce has another 10% chance to gain an additional bounce, and then another 10% chance to gain a third, etc.
For each additional application of piercing, Chaos Bullets will pierce two more enemies, while for each additional application of bouncing Chaos Bullets will only bounce one extra time.
Fat Bullets (between 25% and 75% above normal size): 10%
Unlike with the actual Fat Bullets item, the fat bullets effect on Chaos Bullets only affects bullet size, and not damage.
There is an additional 10% chance to select from the weighted table below:
Makes the target 60% slower for 10 seconds.
The target takes 5 damage per second for 10 seconds.
Charms the target for 10 seconds.
Freezes the target for 10 seconds.
Burns the target for 4 damage per second for a duration of 4 seconds.