13cm K09 ammunition query

[charley777]

Greetings....
This is a real beginner's question, i think.
I just would like to clear this up....
Is the 13cm K09 having a 128mm bore or a 138mm bore ?
I have seen the cartridge case listed as 128x704R (rim 161mm)
and also as 138x704R (rim 161mm)
Can someone please clarify this for me?
Thanks very much
Charley

 

[Hoeksel]

The actual diameter is 138 mm.

 

[Alpini]

And the bore diameter is 135 mm. The case has a different diameter as it is separate loading ammunition...

 

[charley777]

Thank you , gentlemen
This queston had been on my mind for quite some time...
Greetings, Charley