Oh! there's a trick to that!
get the mjolnir in one hand, then get a standard shotty in your other, then switch to standard shotty to stock up on shotty ammo, the two weapons share the same ammo, make sure to reload the mjolnir to 40 rnds, before final ammo top off for max ammo.
for liquid and agent kills the mjolnir is the next best thing to flame throwers.
You lose most long range effectiveness with this combo, but standard fire with the mjolnir while crouched and aiming can do an ok long range impact, or optionally switch to the standard shotty and use the alt explosive slug. Then of course the full auto alt fire is devastating up close.
Let me know next time you want to do an expert run, I just barely got all my app chips yesterday.
