I guess I've never noticed this, but I found a few boxes of WWB 5.56 and bought ten.
Loading mags today I see all kinds of head stamps,
WCC 13
WCC 13 WW 5.56
W C C 1 3
Some have a sealer some don't.
The bullets themselves look different as on some I can see the crimping cannelure and on others it is inside the brass, yet the brass length is the same and the cartridge length is the same.
Depends on where you got it. You obviously have cases from different lots in the same box. Reloads would be my first guess except the "13" headstamp makes that unlikely. My second guess would be leftovers from various lots.
I've seen similar in some boxes of bulk LC, but some of the LC appears to be seconds from the dents and other marks on the cases.
Many different brass cases in a box of 5.56 WWB
Linear Mode
