Like jmcmath said,
I think it has to do with a capability of a cartridge and or rifle set up.
There are many groups out there that have tried standardizing long range and extended/ extreme long range.
I think a short action standard bolt face cartridge 500 yards to maybe 1200 yards would be long range and once you get past that with many of those rounds you are flirting with the transonic region and that I would say is ELR for that round as now you are working with a lot more inputs to make a correct/ accurate or precise shot.
Now with a magnum you may look 6 or 700 to 14 or 1500 yards as long range and past that the same thing where many of those cartridges are hitting that transonic region at or just past a mile (1760 yards)
Lapua, edge and other high power high b.c. rounds you might add on a few hundred yards.
Once you break into the chey tac based rounds and larger there is a whole new situation. Long range may not even start till 1000 yards and go to 1 mile to 2000 yards and past that is ELR.
Really I think it is shooter and gear specific. The shooters skills can either reduce or extend those range boundaries splitting long range to extreme long range. Take a guy who never shot over 400 yards before and gets out maybe a couple times a year to sight in and shoot a couple rounds before season, then take the guy who knows his rifle, shoots many times and maybe a couple hundred rounds or way more in a year and thinks a cold bore 1000 yard shot is warming up their definitions and abilities will be way different.
If you want the general argument distances 1500 yards is where ELR starts, so closer than that would be long range to a point and I think long range may be 500.
Not gospel,not arguing, just my opinion from my experiences
