A few people have said 80-81 and some quick calcs a soc m8 did seem to confirm 80 if you take 45% min dmg as where KS unlocks.
The formula seemed to fit pretty accurately to our current levels in ranged dmg profession, anyway, but it wasn't thoroughly tested. If I remember right the correlation was something like this:
(current_min_dmg - starting_min_dmg) * 4 = ranged dmg prof
(40.83-25) * 4 = 63.32 (my current level)
(45-25) * 4 = 80 (KS unlock)
A quick check on the gain from a 500 ped hunt suggested it will probably take me another 5 years to unlock KS