i would take the shot every day and not think twice about it, 500 yds isnt that far. every marine has shot a 500 yd range w/ a .223 round at a human torso. im accurate atleast 8 out of 10 head shots open sights. but to make sure of the kill i would go w/ the cheytac .408. if you havent seen it check it out. i want one, its only about $14,000....to answer the question again.... yes i would take the shot w/ my model 700 .308 modified