Lee Enfield No.5 MK1 Headspace issue?

[Lucite]

I bought this No.5 MK1 last week and it arrived yesterday. So today I took it to the range to see how it shoots and after I fire two test shots I found that upon examination of the brass I see what appears to be a head space issue. My question is, if my assumption is correct and it is head space and not a worn out chamber would I be able to swap out the No.0 bolt head currently on it with a No.4Mk1 No.1 or No.2 Bolt head to remedy the issue?



First test shot


Second test shot

Information

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[Parashooter]

Your fired cases show normal expansion ahead of the solid web, not a headspace problem.



Normal "scuffing" above the web is often confused with the "bright ring" indicating incipient separation. The two effects are quite different. Some examples -



See Milsurps Knowledge Library - Headspace 101 for .303's for detailed explanation.