I get the whole shoot to stop thing, that is not part of this discussion, but we have ALL been trained to shoot center mass FOREVER.
So lets dive in a bit. What is center mass?
Lets for the sake of argument say that if we knock off all the extraneous “side” muscles, bones and bits on the outer edges the “average” human is about 10" - 14" wide (let’s say 12" to pick A number). From crotch to shoulders is roughly 30" tall. I am talking American’s, not overseas So the average American “center mass hit zone” is 12" X 30". I’m hoping that all of us even with a modicum of training can hit that at 3 - 7 yards (9’ - 21’).
So now lets look at what’s inside that 12 x 30" box.
From the top down:
At the shoulders you have some pretty significant bone structure horizontally (lets say 3" vertically and 12 horizontally ), clavicle, scapula , 1st couple ribs and the top of the sternum. For the squishy stuff, you have the top of the lungs, a bunch of muscle and fat and two 'UGE blood pipes that bifurcate into your carotid arteries and veins in your neck as well as the main air pipe and last but not least tucked in the middle way in the back is the spine. If you hit any of the bony structure you will probably stop the fight pretty quickly, he/she/it may not die but the will to attack will be significantly reduced. Obviously if you put a round in the 3" wide center column the stop by death will have a more substantial chance of occurring and fairly quickly. Getting a round into the spine will stop the fight RIGHT NOW all else might take a while.
Mid Chest or “Center Mass” the 3" column remains the most effective way to stop the fight because of the big blood pipes and the heart and of course the spine. The ribs are painful but not show stoppers and the lungs wont even cause a boolit to expand if you don’t hit a rib. It’s the equivalent of shooting a wet sponge. Unless you can hit the Heart, Aorta, Vena Cava or the Spine (again the spine Stops the show RIGHT NOW) the fight is still on.
Abdomen: From the ribs south to the hips. The 3" center column effects as above are still in effect but spine hits are less life threatening (Refer to the chuckle head in Kenosha that took (I think) 9 hits from a 9mm at less than three yards and lived but is paralyzed) . Nothing in the belly will kill you right now even a liver, mesenteric artery or spleen hit will take time. There is a reason being “gut shot” is looked down on.
Pelvis: You stick a boolit pretty much anywhere in here with enough power to break the pelvis and the fight is over RIGHT NOW. This is where the 3" column no longer works so well with the the spine effects but it will make the legs stop moving. Additionally the big blood pipes are there and split as they do at the upper half. Now this is the dynamic part. The pelvis is some of the hardest bone in the human body as the outer surface is what is called Cortical bone the HARD part on the outside and is the thickest comparatively to any other bone in the body to handle the stress of walking and running. The inner bone is called cancellous (sp) and that is where blood cells are made also acts as kind of a shock absorber. It pretty much forms a bucket of pretty doggone hard stuff. The right and left sides of the pelvis are joined in the back at the sacrum and the tail end of the spinal cord splays out in what is called the claudia equina (horse tail IIRC) which is mostly sensory nerves That is also why breaking your tailbone (coccyx) is SOOOOO painful.
Soooooo with all of the above anatomy you basically have a 3" x 12" “+” at the the shoulders and an 6"x12" “O” at the pelvis and a 3" column in the middle all the way up connecting the two. If you are able to maintain a 3" group when your A$$hole slams shut around your neck in a real gun fight then you are THE man/woman/identified. I would submit that most will be lucky to keep rounds in the 12" X 30" box. If police shootings are any indicator that doesn’t happen often. That said civilian shooting seem to be significantly more effective which of course is why we are all here. We’re better trained than most LEO.
Cheers,
Craig6