just play mayhem (mayhem clash works best if it is available), wait until you get your supper, switch to TLW and throw hammers until it is out, take TLW off so your deaths don't slow you down, and repeat. As long as you don't have too many deaths while TLW is on you should finish that part of the mission in 6-10 games. heavy ammo works for this too. You get a bonus toward the mission for chain kills and multi kills so any supper that can kills multiple targets is great for this