I'm on my phone so itd be a pita to do it myself but if you google sherbune wma louisiana and go to the wlf site you can find an address then use yahoo, google, mapquest, gps etc to get your directions...
from lafayette, head north on 49 to 190, head east toward baton rouge.. once you cross the big bridge in krotz springs, take a right, it'll loop around then you take a left onto the dirt road. follow that for a few miles and on the left you'll see the road to the range, there's a big sign and a building with target stands and **** out front that are visible from the road.