Mix headstamp

[tabascoz28]

These are all various once fired (pretty sure) brass.

Left group is Win USA and weigh 95 grains
Right group is WCC and weigh 98.5 grains

Each group has what I think are 223 and 556 differentiating markings but am I correct in assuming they are physically the same.

They are all annealed (one doesn't look it but it is) and crimped.

w1.jpg
w2.jpg
w3.jpg

[M1NM]

Exact same thing. 5.56 = military designation and crimp will need to be removed before reloading.
.223 = civilian designation for the 5.56 cartridge. Probably not crimped.

[bhilliker@comcast.net]

Someone correct me if I'm wrong but isn't the 5.56 just a hair longer than the 223. Seems when I'm trimming I see the difference and have heard it mentioned on here before

[tabascoz28]

Different brass brands has different lengths, strengths and every time it's fired it changes too, there's a tolerance built into the chambers.

Once I get done processing they are all the same length though...

[kcheung2]

My understanding is that the 5.56/.223 difference is in the chamber dimensions, not in the cartridge. I've never seen a 5.56 reloading die set, only .223, does such a thing exist?

And if the crimp remains, then it's once-fired.