I agree with Lee. Wind is the single biggest issue to contend with. Not so much from a camera stability perspective (I use a nice, heavy monorail), but due to subject movement. I regularly shoot tri-x in 5X7 rated at 160. Since you use shadow based exposures more with sheet film rather than "average" exposures with 35mm, with a YG or Orange filter, I'm usually shooting at 1/2 sec at f 32 or 1/4 sec at f 22. I'd like to find an even faster film if I could.