A scope required for "Long Range"?
Well, I could argue that one, and easily win.
Locally speaking, this past Memorial Day weekend, we had one of our younger (13) Appleseed Instructors zero his M1 Garand at 25 meters, then click in the standard "come-ups" to take it to 500 yards. He shot at a steel target, about the size of an IDPA sihlouette. First shot hit.
Rack grade (as issued) M1, ammo that's equivalent to USGI issue M2 Ball (may have been Lake City M2, or Greek equivalent) and definitely iron sights.
This past weekend, we were shooting out to 400 yards at Jericho. Most of the shooters were hitting at 400 yards, some of them shot very respectable scores, and some of them were using irons sights.
Many matches out to 1000 yards have been won using iron sights.
Now, a lot of this boils down to just what you consider long distance. Some folks think 200 yards is. Others 400. Some 500. I say 600 and up, because the stated maximum effective range for most modern battle rifles is about 500 yards. Therefore 500 and under would be normal distance.
Consider this. I'm now 54 years old. Been wearing glasses since I was in 2nd grade (should've been wearing them before that). I can get significant hits with a rack grade AR (think as-issued M16A1 and M16A2) out to 300 yards, and normally can easily do it.
I'm nothing special. Yes, I teach marksmanship, but I was shooting well long before I was teaching it.
I did that during annual weapons with the Army Guard. When I was in Boot Camp (1972), we had to shoot out to 400 yards, and that was doable as well.
Here's some records to consider:
http://internationalbenchrest.com/download/Record Posters/LongRange2009.pdf
Those are definitely scoped rifles, under .40 caliber, the Light guns are limited to 17 pounds, the Heavy guns have no weight limit.
I'm telling you, it isn't as hard as folks make it out to be. Being good at it requires some training and a LOT of practice, I'll concede that.
And, pay close attention to what Jose is saying, because he's totally right.