BigBL87 said:
223/5.56 actually penetrates LESS than most pistol rounds on average, due to its tendency to fragment. All the other arguments have their merits, but penetration is not a valid one.
I'll accept everyone's claim that .223/5.56 penetrates less than I thought, but a number of videos (two posted below) suggest that fragmentation and penetration is better for the rifle round than most claim. These videos DO support the claim that the .223/5.56 round DOES NOT super-penetrate (which was my concern).
The .223/5.56 round DOES do more damage early on, however, than a handgun (and since it's traveling at more than 2000 fps, likely to have more demaging effect on a human target. (If you found it necessary to shoot through a wall to hit someone on the other side, the .223/5.56 is likely to be a better stopper than many handgun rounds.)
Note: there's probably better loads for all of these tests and better comparisons than the ones compared in these videos, and a longer-barrel carbine will probably perform somewhat better than the shorter-barreled handgun version of the same basic weapon (that is the subject of this discussion).
Here's two videos easily found. The second video might suggest that shotguns rule (00 Buckshot.)
9mm vs 5.56 (through wall and water jugs and vests)
https://www.youtube.com/watch?v=fiAQT96j2ZY
The following video suggests something slightly different, but all weapons get the job done.
9mm vs. 5.56 vs. shotgun (drywall penetration)
https://www.youtube.com/watch?v=AXOIQgfvVlE
g.willikers said:
Got to admit the intimidation factor is large.
A lot of folks may not be
as intimidated by a .223/5.56 handgun as they would by a shotgun, because they may not understand WHAT IT IS they are facing... Intimidation assumes you still haven't decided to pull the trigger and only works if the other person SEES the weapon (i.e., is close, you're in the light and both the weapon and you can be seen) -- conditions that put YOU at a possible disadvantage. If you've already fired it, some may be intimidated while by the flash and bang (shock and awe!), but others may be firing back.