So the 5.56 tumbles in some materials...including people... Pick 5 common household materials and shoot with a 55gr FMJ and a 115gr 9mm. Decide which gun you want to hide behind all the materials from... I'll take the 9mm to be shot at with, especially out of a pistol, but even a carbine. Obviously a hypothetical...I'll pick neither in real life.cyphertext wrote:ScottDLS wrote:I seriously doubt that... There's not nearly enough information in the hypothetical to make that blanket statement. As a rule, all else being equal (which it never is) the bullet with the greater velocity and less front facing surface area, will penetrate more of the same material, than the slower fatter one.Nuts wrote:.223/5.56 has less of a chance of over penetration then 9mm.
We've all seen the Youtube with the 9mm going through 5 sheets of drywall while the 5.56 doesn't. It's a cool video, but has effectively no application to real life. To get the best answer, you have to consider the material, the angle, the distance, the number of different materials, bullet type (FMJ, HP, JHP, lead, etc.), distance, and so on and so on. Just because somebody got a 55gr FMJ 5.56 round to tumble in a few sheets of drywall doesn't mean it's going to do the same thing in your house.
If I'm faced with a bad guy in my bedroom, and have a choice between my 9mm SIG and my 16" AR-15 carbine, I'm taking the pistol. If the guy's shooting at me from down the street, I'll take my rifle. No way I'm popping off a 5.56 in my house thinking it has less chance of hitting the kids' in their bedroom than a 9mm.
Experts in LE and military would disagree with you. Of course it comes down to bullet choice. I doubt that folks who are addressing penetration with 5.56mm are advocating using xm855 as the ammo of choice. But even the 55gr fmj has shown to lose velocity and break apart when impacting common household building materials such as sheetrock.
I've shot .223/5.56 out of rifles and 9mm out of pistols and machine pistols against all kinds of materials and the 5.56 almost always punches through. My apocryphal examples are Mini14 at a steel soda syrup canister. Rifle went through both sides. 9mm bounced off .357 went through one side. 1/2 in plywood rifle straight through, 9mm you could dig out of the dirt behind the plywood.
I would like to see something other than a Youtube video as evidence that a 9mm regularly penetrates more than a 5.56mm.
