Click Here Get Notes by EmailToday: Lots of information about the 5.56mm round and what it can do for you… and what it can’t do. Lots of myths out there but less facts. Here are some facts to help you determine what ammo you should use.

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Podcast Outline:

Difference Between the 556 NATO and .223 Remington

556 Case Mouth Conducer 55,000 PSI; but SAAMI says it’s closer to 60,000 PSI

.223 Copper Units or Measure (CUM) or called Mid Case Transducer, SAAMI says the max 55,000 PSI

SAAMI Spec vs NATO Spec Chamber

Chamber the same except the throat or lead

.223 is 0.085”

56 is 0.162”

Cartridge Difference

Interchangeability (you can shoot .223 and 5.56 in a 5.56 NATO chamber, but not the other way around. Buy a 5.56 chambered gun)

Ammo I’ve Used

556 NATO 62gr Green Tips (M855)

556 NATO 55gr FMJ (M193)

Military Moving

M855A1

Marines stuck on M855

But using MK318 Mod 2 in combat

Rumors of 75 or 77gr long range bullets

Change is coming

For Home Defense

Trusted 55gr FMJ

Ballistic Performance

Everything else you give up performance in tissue to gain other things

Ammo companies and what they will give us

Considerations

Do you need barrier penetration?

Length of Barrel

Creates different velocities

Different Velocities mean different yaw and shatter points

Shatter is what gets you desired effect

Has to being going fast enough

About

2600 FPS or above to get shatter

16” 2800 FPS at muzzle

20” 3000 FPS at muzzle

From Ballistics by the inch

18” 2983

16” 2943

14” 2878

12” 2616

10” 2380

Anything with a shorter barrel needs a different kind of ammo

Consider Hornady TAP

With short barrels and 55 gr bullets not much more then a 9mm

Consider the longest shot you may take

Wall Penetration

If you go extra heavy barrel twist matter

 

Thanks for listening, don’t forget to check out the Shooter’s Club.

Stay Safe,

Ben

 

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