5.56mm Winchester Whitebox

[clutch]

I may have figured it out just typing this. I have a upper and lower on order to build a service rifle and I wanted some ammo on hand to shoot it when the halves show up. Just plinking ammo for now so I bought some Winchester white box at the grocery store and noticed it had crimped in primers and a WCC 09 head stamp.

I was going to ask if .223 ammo typically has crimped in primers but while typing this I realized it is 5.56mm which likely means military spec.

Can I assume that .223 marked ammo isn't crimped for reference?

Thanks,

Clutch

 

[Fumbler]

You are correct. The majority of 223 is not crimped. A few commercial loads will be crimped. These are usually self defense/duty loads.

 

[Hatterasguy]

Its 5.56 make sure your rifle is chambered for 5.56 and not .223.

It sounds like your building an AR, it should be able to swallow 5.56 without any problems.

 

[unwise11]

If you plan to shoot 5.56 get a 5.56 barrel or "wylde" chamber, you will face problems shooting 5.56 in a .223 chambered barrel.

 

[clutch]

If you plan to shoot 5.56 get a 5.56 barrel or "wylde" chamber, you will face problems shooting 5.56 in a .223 chambered barrel.

The upper I have on order has the Wylde chamber. Now I gotta google what the difference is between the three.

Clutch

 

[unwise11]

5.56 sometimes shoots better with actual 5.56 spec ammo, Wylde can shoot both well (jack of all trades), and .223 can only shoot .223 safely..