Simon, the above notes are based on individual experience, some wildly high and some more "
normal" from my experience. I have shot pd in TX, Wy, NE, SD, Co, and two things are consistent.
Weather is a factor, if it is too hot they go down late morning and come up in the early evening,
rain and heavy cold, they stay down, come up only when necessary to eat, come up active after it clears
towns vary greatly, I have seen them 100 acrea and 1 mile by 600 yds., I have also seen them empty as the plague and property owners poison them as cows, horses break legs stepping in the holes at night.
as a rule, a "live town' 200-300 yds by 1/2 mile will give 200-500 shots a day depending on the weather, and health of the pd,.
22lr, 221, 222, 223 22-250, 243, 22br, 6br + all are great
try using Google earth, look in the western states from low altitude and you will see dog town as white dots scattered over an area. example try 41'58' N by 108' 18'W look for dots zoom to 6000ft.
Bob