The problem was in you stating that 5.56/.223 was range limited to 600yds when in fact it technically is not. I don't think anyone was arguing that it would be a difficult task to hit a target at 1000yd with a 5.56/.223 especially in the areas of wind reading. However, the fact is the 5.56/.223 is not range limited to 600yds but the skill goes more to the shooter's ability to successfully hit targets when the range increases.
I would probably wage a pretty good amount of money that quite a few people frequenting these forums, myself include, couldn't hit a target at 1000yds consistently with a .308 much less the 5.56/.223. It does not mean those calibers are range limited but it means the skill of shooter is not developed enough to do so. It is more about educating and helping with the facts than stating things that are not accurate in the way you state them.
Stating that it is range limited to 600yds is almost like saying that since a car has a handicap sticker or license plate, then the car is automatically limited in speed and performance and will be worse than another car without a handicap sticker or license plate.
I would probably wage a pretty good amount of money that quite a few people frequenting these forums, myself include, couldn't hit a target at 1000yds consistently with a .308 much less the 5.56/.223. It does not mean those calibers are range limited but it means the skill of shooter is not developed enough to do so. It is more about educating and helping with the facts than stating things that are not accurate in the way you state them.
Stating that it is range limited to 600yds is almost like saying that since a car has a handicap sticker or license plate, then the car is automatically limited in speed and performance and will be worse than another car without a handicap sticker or license plate.