When at the range you tend to be standing or laying flat or sitting and the scope is on a tripod, could be adjacent to you or anywhere so long as the glass is out of blast and vibration range. Thing is, the ground is flat, you are in no hurry, you can adjust the tripod for wind gusts, just routine stuff. However, when you look at what you are shooting , you look down. You don't see the target and its background, location, nothing. It is in a fixed location so all of the 'where is the elk at' questions don't arise.
Now, in the field, you look and point your scope at an area, using your EYE to make adjustments to the direction of the scope lens.
So you need to think about two. I have broke innumerable spotting scopes at the range and quite frankly the cheap ones do okay at sub 300 yard ranges. Beyond that and in the field you need to step it up and in my opinion, way up. The reason is in the field you don't look through the scope for 10 or 15 seconds but for minutes and cheap glass will give you eye strain and headaches pretty quick.