It does not need to be exact but close.

this is for a Me-262 Diorama I have planed.
I am not sure but its BIGThreetoughtrucks wrote:What I could find on this cartridge shows the size as 32.8mm. Is this the baby? If it is, what is the length in inches?
I have loose 1/6 .50cal, 20mm, 2.8mm cannon. In belts, of course I have .30cal, 50cal and 7.92mm.
Give me the inches and I'll photo was is close to 30mm in 1/6 size to see if it is any use to you.
TTT