My loadout:
Bozar (Joshua just laughs off the damage when I tried using this)
H&H Tools Nail Gun (While it served it's purpose of injuring Graham's limbs, I think that just made him angry)
MF Hyperbreeder Alpha (My melee weapon. I doubt I'll be killing him with this)
Ranger Sequoia (The only one of my guns that managed to punch through his armor, fires much slower than his Light Shining In Darkness which was my undoing in practice)
Lucky Shades (for 10 luck)
Marked Scout Armor (Coudn't find anything better that looked Legiony, might switch to Centurion armor, if losing the Light Touch & Travel Light bonuses won't cripple me)
Slave Scarf (gotta look good for an assassination)
So any tips? I can go out and buy better stuff if have to, but I'd prefer to use the weapons I've got, if at all reasonably possible. I'm sure the actual battle will be even more difficult than practice, since I'll also have to prevent Salt-Upon-Wounds' death until after I've killed Graham.