possible headspace issue?

[smle addict]

Nah... That's normal for the 303 round. If you reload it for it, full length re-sizing will eventually cause case-head separation.

If you don't reload, just enjoy it. I have some cases that look similar to yours, if not worse.

Hope this helps.

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[RaunchyRifles]

Thanks that helps a lot. How bad is a full separation?

[smle addict]

Not too bad, so long as you have a stuck case remover on hand. I have one for the M-60 machine gun (I took a couple when I was in the army), and it works well.

See attached pic of over-worked brass. After about 5-6 reloadings, I start to see cracks forming, and throw them in the trash. These got by me, and came apart.