If you have little equipment (inn other words, if the 76 has the same radio/nav gear as a typical Huey) it can carry a reasonable load. Light 76's can tow in at about 7000 lbs EW while the typical corporate and offshore ones are at 8300+.
The vis is certainly an issue, there is one bubble window version out there somehwere, though.
IMHO, logging with an S-76 is like logging with Nichole Kidman. While she might do the job, there are surely better things she can do.