This was one of my favourite fights in the game, as you've got two well'ard so-and-sos after you. Great opportunity to use up some of that ammo I'd been stockpiling, I let 'em 'ave it with secondary fire grenade launcher, magnum, shotgun, smg and a couple of barrels.
In hindsight I think you are probably supposed to conserve ammo and make more use of the mavity gun + barrels but it was nice to actually get to use some of my ammo for once.