Spotting is very important for mid 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.
I like my Vortex Razor with MOA ranging eyepiece. I consider it to be the best spotting scope for long range shooting. It is perfect for our Nomad Rifleman experiences, and with the optional fixed 30 magnification ranging reticle, it is fast and easy to measure misses distance from the target.