I shoot highpower which is standing at 200yds, rapid fire sitting at 200 yds, rapid prone at 300 yds and slow fire prone at 600 yds. I shoot a bolt gun in 260 but if you go to a match at least 80 % of the shooters are shooting AR's. The shooters using longer barreled, 24 to 26 inch rifles in 223 I believe have a easier time with the wind at 600 yds. I have been beaten more than once at 600 yds by service rifle AR's which have 20 inch barrels and you have to be lucky or very good at reading the wind to win at 600 but the good wind readers do very well at 600 with the 223 and usually 80 gr mk's. The 260 I shoot is easier to beat the wind with at 600 but the AR's have an advantage shooting rapid fire and I think the 223 might get twice the barrel life than the 260. I know the 308's get twice the barrel life over a 260. The 223 uses 1/2 the powder, bullets are 60 % of 6.5 bullets, right now primers are 60% of large rifle primers, whats not to like. A year ago I took a young fellow who read too many stories on the computor to a 1000yd match so he could see the realities of contending with the wind and a fellow wqs shooting f class with a 223 bolt gun and he did very well, he was a talented and well practiced wind reader and with a cartridge that doesn't eat barrels and if economical to shoot a person would be more inclined to shoot more at long range which is the most important thing to become proficiant at hitting your target.