Need id on some old 16 ga slugs

Hi all,
Today I got some old slugs, I cannot id.
Any help is welcome.
No. 2 and 3 are likely the same but have different lenght.
The longest one seems to mis the piece of cork.
About no. 4 and 5.
It could be the last one has the inside drilled???
No other markings can be found on them.

Regards René

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