It is not difficult to identify a deer standing in the clear at 100 yards. It's not like it appears as little brown smudge that needs further glassing to determine it's a deer.
My criteria for shooting a buck is age class not rack score and I can tell that within 100 yards so there is no need to study a buck before dropping it.
But I will always check the forehead of a lone doe before dropping it. It only takes a second.
