Well I just procured a 6L bottle. It came with the cork and I might have to rescind my previous comment about the cork being a different size. Eitherway I can't wait to fill these.
When it comes to cages for these big bottles I will have to custom make a restraint cage of my own using safety wire. I have seen "artsy" prosecco bottles with string holding the cork in which would likely work just fine here too.
From left to right we have:
6L Methuselah
3L Jeroboam
1.5L Magnum
750mL
375mL
