I interpreted your remarks about other objects need to determine range as just that. Maybe I interpreted incorrectly.Well I guess everything I've learned from being in the USMC as an 0311and as a Police instructor of both long guns and pistols was wrong lol. Bullet Drop compensation, angles, wind speed. Type of ammo was it a. 22 subsonic or .22 60 grain minimag High velocity. Yes 200 Feet is not a long shot, but shooting something out of the sky at 200 feet isn't the easiest shot.
As to you stating you don't need objects to range a target out is totally false. Unless your referring to using a rangefinder, or a BDC of an Optic.
Regardless the target provides its own dimensions for range determination and no other object needs to be near of far to aide in any way. The target dimension is the target dimension and that is all that is needed.