Quote Originally Posted by kdrakari View Post
Maxing weak bullet only reduces the cooldown by 30 seconds and allows you to use it on 4 enemies at once. Personally, while the cooldown reduction is nice, don't think I would find enough situations where using weak bullet would be worth the time it would take to get all 4 shots applied, considering they cannot be used on the same enemy, they do no damage, and while you're applying the rest of the shots the first one will run out that much sooner.
The unspent weak bullets stay unspent until you use a normal attack and that means you can mix high damage rifle PAs in and then be able to reapply a weak bullet again when the first runs out. This also counts toward cool down time. And like YCCB said, you don't need to worry as much when you miss. Having to wait two minutes on cool down when you miss sucks.