I've tried with Corrupted Aphelion and Sporebloom, and neither of them has procced Bandit even once. Even if the multi-pellet thing was changed I would expect the listed 30% chance, but it hasn't refunded ammo a single time on either weapon, which indicates it just isn't working.
#Bandit seems to proc less often than the listed 30%.
sharp pecan
Update: It has some effect, but the fix broke it in some way. It's proccing far less often than 30% of the time. I tested with Alpha/Omega and got maybe three or four ammo back in the mag after a whole mag dump.
sharp pecan
Bandit/Devoured Loop seem to not proc as often as they should.
sharp pecan
Bandit seems to proc less often than the listed 30%.