Split necks with No4 Mk1*

[8udr]

When using 1949 Radway Green ammunition in my Longbranch No4 five out of every ten rounds are ejecting with split necks. I have no problem with my home loads. Is this common?

Information

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[vintage hunter]

Yes, it's fairly common with old ammunition. Brass gets brittle with age. As long as it's not splitting past the neck you should be ok.

[Mk VII]

Common in British stuff where the neck was cold-formed on top of the cordite.