My brother in law purchased a large pasture farm that he wants to convert to a horse farm. It is crawling with big fat ground hogs. As some of you know, ground hog holes can break a horse's leg. Big ground hogs can be very tough creatures. You would want a round sufficient enough to stop them before they can crawl back into their hole. Would the 5.7x28 be enough of a round to anchor a big ground hog with one shot? Do I need to get close enough for a reliable head shot? Which 5.7 round would be best? I have a 2-7X32 scope on my PS90 TR and feel that I could make a clean head shot at 25 to 50 yards.