Spotting is even more important for mid range shooting than long range shooting. Depending on the shooter’s experience, the target backdrop and the type of rifle they are shooting, typically around 600 or 800 yards, a shooter will be able to see their own impacts in the dirt. If the target is on an even plane without a backstop, having a spotter becomes more important for spotting trace.
For long range and extended long range shooting, a high quality spotting scope is very important. See our updated summary of top spotting scopes for long range shooting here: https://shootingexperience.com/best-spotting-scopes-for-long-range-shooting/