I'm in western Colorado. I have shot PDs here, and in Wyoming and Utah. At certain times and places, I and a buddy with me would each fire over 500 rounds in a day. We would each have 2 or 3 rifles - you can overheat just one shooting like that. --- When the mounds are that thick, I try to not get out of the truck at all, preferring to shoot out the window. PDs are notorious for having fleas, which can carry several diseases. If you are going to be out walking around where they are thick, by all means use permethrin or other such potent insect repellant on your pants legs and shoes!!!!