Level 40 and almost done. Benny's 9 mil is making short work of the tunnelers. I need the marksman's carbine for the deathclaws and marked men. My munchkin build in which I took every perk and trait related to reload time, rate of fire, and action points means that I can get in 20-30 shots in VATS with guns with very low AP costs when they close in. Only the criticals do much damage, but there are usually enough of them to take down anything, excepting groups of deathclaws.