A double lung shot deer will only run as far as it can hold it's breath. If it has just exhaled, it'll drop. A few years ago I shot a buck that was almost straight under my stand with my 30-06. I only hit one lung and the deer ran about 90 yds. before it died. Single lung with a bow?? that could be hard to say. Might run 50, might run 5 miles. Hope you find it. Scott Woody