24" 223 is NO LONGER or heavier than 308 auto rifle, and with 80 gr vld's, still has 500 ft lbs left at 700 yds. With 75 gr vmax sp's, it's still got 500 ft lbs left at 500 yds, still has 1800 fps, still EXANDS that sp. So you get hit like you would at 10 ft, from a 4" 357, using 125 gr jhp's. In other words, you are DONE being a threat to anyone who is 500 yds from you and is just openly, head on prone towards you. You are done being a threat to anyone who is using cover at a mere 200 yds from you, because, your blood pressure dropping like a rock, you can't FOCUS enough to hit such targets, before you DIE.