Where’s your go? You may not like it but it is your turn…
Here you go.
7.62 X 25mm ?
Mmmm nooo. Little bigger.
9 x 39
Ding ding ding we have a winner.
My first thought was x39 whisper.
Here’s one I shot today about 10 seconds after learning of it’s existence:
Another pic, the 3 on the left:
.357 sig?
…or 25NAA?
Warm, got the right idea…
Right idea again but larger
Edit:
Hint - it’s an old wildcat cartridge that became popular in Australia in the 90s due to certain new laws restricting certain calibres.
It has 3 names that I can find, one of which is apparently named after the PM in power at the time.
Never heard of a Keating or Howard
is it 32 cal?
Neither had I. Bloke who handloaded them was a wealth of information.
or maybe 40 Super
Bottle necked pistol cartridges are my fetish 
Getting much closer re: the case
No
400 cor-bon looks like a necked down 45acp
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It certainly is a .45ACP case necked down.