Guessing by my epic 107/40 (nightbane with tacvi +5 dmg aug) max hit for me is 780, far as I can tell for a knight at least it's about 6 dmg per 1 dmg increments, putting that weapon somewhere around 880 or so max hit and probably close to 2k or better crits.
btw 48dmg bonus doesnt mean the weapon is like 48dmg higher.. ie. 12dmg weapon would be 60dmg weapon.....no it means that if you were gong to have a max hit of 200..now you will have a max hit of 248....