Hmm...where to start?

Anyone taking five-hundred yard shots had better be spending weekly time on a 200+ yard range. It takes a hell of a shooter to put 5/5 in the black even at 200 yards...300 yards all the more and ranges that can accomodate 300 yards are rare. Factoring in 38 inches of bullet drop?...sigh...

500 yards with a .243? I'm afraid I can't recommend and would be embarrassed to admit it if I were to actually try such a shot and to pull it off. Truth be told, I couldn't smile about anyone taking 500+ yard shots regardless of caliber, quarry, or success...

Such a boast hardly makes a case for any caliber, much less a .243

But I understand your fondness for the caliber, I've taken at least four bucks with a 6mm including a monster Mulie...but it wouldn't be in my top 3 choices.

By the way...grats on the shot of a lifetime (no sarcasm intended).