To get my sponsorship for an upgraded car in Rage, I had to do Mutant Bash TV and luckily was pretty well supplied with shotgun ammo. But what would be the ideal way to prepare for farming Mutant Bash TV?

Should I simply stockpile on shotgun ammo, given how powerful it is? Or would one of the automatic riffles be more effective in close quarters? Or would any of the drones, like the turret be of use as well?
I'm planning on doing it a couple of times, because shooting mutants is fun and the pay is very good!