500 freight train?
Yes to the “some kind of.50”
No, but you are getting closer.
I think I have it finally, 510 whisper?
Iv’e never seen that one before, what a cool round!
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That’s the one. Very interesting reading about it and the fact that it only drops about 100ft/s over 500 yards.
Is it a rifle cartridge or something that goes into a shotgun?
A rifle mate
A blackpowder round?
A 400 nitro.
Yes to black powder, no to 400 nitro.
It does have a 4 in the name though
Wow $27,700 for a box of 10 cartridges
No wonder you want it in single shot.
4 bore ???
Yeah mate 4 bore it is 
@GUN-DMC Here is a small article that tells you how expensive they are to shoot…
https://www.theexplora.com/kynoch-and-eley-4-bore-4-inch-black-powder-rifle-cartridges/
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Is it a 7.62×53mmR?
G’day Wombat,
Now you’re talking my kinda lingo! Question is, is it the Navy one or the Army? They are different, of course.
Crazy how much some collectable ammo goes for.
Bertrams make new brass and CBE in brisvagas make a 4 bore mold too.
It would be an awesome gun to have and shoot( from time to time, lol).
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Is it 303 link?