Yes, and that notion was wrong at several levels. That's why we are discussion it. First of all he was not comparing .50 to .44. He was comparing .50 to modified .44. Mod which in some abstract way adds damage to .44.
Second of all, "common perception" is not argument. There used to be common perception that Earth is flat and Sun turns around Earth. Common perceptions are often wrong.
Penetration is in game terms cowered by separate value called "damage resistance" and "armor piercing" ability. Environmental protection is not modeled in game at all, so your brick wall example is completely irrelevant. Brick walls in Fallout stop everything from pistol round to canon fire without exception.
Which human body part have thickens of 18 inches? 18 inches is about maximum thickens of chest of very well build man. There is reason why those ballistic gelatin blocks are 18 inches long.
Yes you can gain shots which go through more then 18inches of human tissue if you shoot at the angles close to be parallel to human spine. But that's also the most improbable angle you can shoot at a man.
On the other hand most hits are going to penetrate much less then 18 inches of a tissue and in that case .50 is going to do minimal damage. It will shoot clear through leaving hole little bit more hen 0.5 inch in diameter. About 1.5-2 cm.
What you also fail to notice is that once .50 finally starts tumbling, which is past those 18inches, it doesn't do any more damage then most other rounds. That second 18 inch block did not explode in to little bits, did it?. Maximum diameter of it's wound is at no point larger then that of much smaller .308. That's because at that point .50 lost lot of it's speed and therefore energy.
That's true and I am aware of that. But in case of lack of video of impact and picture of wound cavity at the real body, that's the closest thing you can have in terms of realism. If you can provide pictures or videos of .50 impacts on real bodies and their results, you are welcome. So far however neither you nor any other poster, including those claiming that .50 sewers limbs, cuts bodies in half and cause bleeding just by passing around provided exactly nothing to back their claims.
I at last provided video of what .50 does to ballistic gel, which is specially designed material to simulate body tissue. And you know what, it does not show crazy damage some posters claim here in their fantasies. I hope you can agree with me, that if that .50 failed to tear apart those gel bricks (even the second one once it started to spin and shattered in to bits), it's unlikely it will cut bodies in half or cause internal bleeding just by passing by and other nonsense.
Those are lot of ifs and considers and so on. Please go on and show me effects of what .50 does to the bone, to the skin and so on. Nobody so far provided a single shred of evidence about .50 mythical power except campfire fairy-tale about soldier bleeding to the death after bullet flew close to him. Utter and complete nonsense.
Btw, no, shattering of bone can not tear limb apart, for that you would need also to cut muscle around it. Which .50 can't. Not even under best condition because bone is always in the middle of the muscle so there will always be muscle in the front of the bone, which .50 passed through without doing much damage.
As for armor protection, skin bone and their effect on .50, yes it can slow bullet down and cause it to spin or shatter earlier then 18 inches deep. However what you forgot to take in mind is that it will at the same time slow that bullet down depriving it of it's energy. At which point .50 will not do any more damage then less powerful cartridges do.
There is no direct relation between energy of bullett (determined by it's weight and speed) and size of wounds. That was disproved many times by clinical tests. Whole energy deposit theory is a myth. That's not to say there is no relation, there is, but only in accordance to other factors like shape of the bullet, it's material properties and properties of place it hit. And here design of .50 goes against it's wounding capabilities, because it's shaped and made of such materials which does least amounts of damage. Wheres most common .44 are exact opposite, they are designed to do maximum wounding damage. At the cost of penetration. And that's perfectly logical, .50 is designed against protected material targets while .44 is designed against unprotected living beings (both humans and animals).
And then still OP compares normal .50 to .44 which was moded for maximum damage, what ever that is in game terms.
.44 is very powerful pistol round. In fact it was designed to be used in both pistols and lever action rifles and is used to hunt the biggest game (with modified bullets) and for that reason it is considered dual purpose round (pistol and rifle). Now can .44, when modified for maximum damage (for example by overloading it's charge, using heavier bullet and modifying it's tip) do larger wounds then standard .50? I think that's not impossible. In fact it's quit probable under most conditions given .50 have about the same wounding profile like .308 just better penetration.