Big boys are made up of grass over a large area. Many operations are a couple hours from one end to the other just like guys row cropping. Mostly 80's and 160's here and there with 40-80 head bunches. 

Most guys I would guess in the 80-120 head range spread out over 10-20 miles. A lot of pasture is gone and is in row crops. It seems like down in the SW part of the state they are more contiguous but still spread out a ways.