Quoted: Hi guys. How far can most people shoot w/ nothing but just iron sights?
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It depends mostly on the eyesight and skill of the shooter.
Of coures the accuracy of the rifle/ammo have to be up to it, and the size/color of the target (too small or if it blends with the background is going to make it tougher).
As to can you see the taget at 100y? 100y isn't a far shot for a rifle, and most targets that are sold at stores should be rather easy to see and hit. If you want to start easy try using a 8-12" paper plate at that distance.
600y is routinly shot at High Power matches using iron sights - but they use a large contrasting target to do this. You'd NEVER see a soldier in uniform at 600y under most conditions. That is the kind of difference the taret color/size makes
Yes EOTechs do make the job easier as there is only 1 plane to deal with (the target plane) rather than 3 planes (rear sight, front sight, target). This is the advantage of collameter type optics.