Sam1911
Moderator Emeritus
I think I probably tend to leave my scopes on the high mag settings. The ultimate end use is always something to remember.
Best practices, for most shooting conditions, is actually the opposite. You can hit what you need to hit out to at least 150 yds. with a scope set on somewhere between 1x and 3x magnification, easily. And at those low magnification levels, you have the maximum field of view and highest/easiest speed onto the target, so if something pops up close, and/or moving, there's no "hunting around in the scope" to try and get the crosshairs on it. Look through the scope (best with both eyes open), see the crosshairs superimposed on the target, press the trigger.
If at some point you see your game animal appear at greater distance, you're much more likely to have all the time you need to roll that magnification ring up and zoom in on it, if you feel you should.