Nothing if i can help it. Though if the launcher is critted, i dum the ammo right of the get go.
I wouldn't say nothing but I definitely dump after I lose the weapon for that ammo.
Mechs with machine gun ammo annoy me a lot because they should've carried at the minimum 3 machine guns preferably four because in that era where heat is a serious premium they weren't a bad weapon, just installed incorrectly.
Why have machine guns in the Cicada's legs? The best defense for a Cicada at fisting ranges is to perform a kick which is prevented by firing machine guns so I'm forced to dump the ammo immediately.
Two mechs that don't carry machine guns but have horrible design implementations of ammo based weaponry are the Jagermech and Kintaro.
The Kintaro has nothing but ammo in both side torsos which guaranties any crit occurring in these locations will destroy it unlike other mechs that have something to potentially absorb the crit.
The jagermech takes one tiny step forward of the Kintaro by having a medium laser in one of the ammo laden side torsos. Then it takes several leaps back by having 55% of the armor of the Kintaro making it the prime example where Kleenex for outerwear doesn't just look silly on actresses and pop stars.