Judging by where you are from I am going to go out on the limb and guess you are Army, or have something to do with the Army. Without ever looking at your profile. But where are you originally from. Picture being in PA where there is areas where the coyotes are as thick as syrup at good times, especially at night. You are on a wide open farm field with a good downhill slope. Flip on 5 KC daylighters and it is pretty close to well daylight. Add in a 65 grn .350 round ball exiting the barrel at 2200 FPS and 700 ft/lbs of energy with a max 70 Grn charge, at 120 yds it has 1,796 Fps and 470 Ft/lbs of energy. With a 75 yd zero at 120 yds it drops only 3.5 in more on the way to the target and a time of flight of .18 sec.
I would say I put about an additional 2 in of hold over and 3 in kentucky windage for a full value 15 mph wind of where center mass, or area where I believed the heart would be located. Figure those ballistics in and you get a center mass hit.
It cleared through both lungs, half way between shoulder and gut.
I don't know your shooting experience or how into ballistics you are, or your MOS in the Army. But if you are the average soldier with limited experience other than hunting, and some plinking. I can see why you would say really to this night shot. But if you are SF or maybe a good Infantryman I believe you could make this shot.
Oh can you tell I research the ballistics for every firearm I own and what it's capabilities are. But according to the average soldier the M16 has a maximum point target range of 300m. When it is actually 550m on point target and 800 on area target with the peep sights. Not dissing the Army.
And to add that was one shot just to see if it would. Most of my shots where no more than 50 yds. That was the only long shot. I put a 75 yd zero on my ML's so I can take a short or long shot with no drastic hold under or over. My .270 at 100 because it has a 450 yd point blank range