I think you will find that this is the base of a flare case. I believe that 27mm is the standard size for a flare pistol.
Looks like flare gun too me also.
I specialize in M1 carbines and Lugers.
Could be the driving charge for a large caliber mortar round. 27 mm is big though.
Aircraft engine starter cartridge?....
It's a wasted trip baby. Nobody said nothing about locking horns with no Tigers.
I'm Spartacus, not really i'm Paul!...
'I do not think we can hope for any better thing now.
We shall stick it out to the end, but we are getting weaker of course, and the end cannot be far.
It seems a pity, but I do not think I can write more. R. SCOTT.
Last Entry - For God's sake look after our people.'
In memory of Capt. Robert Falcon Scott, Edward Wilson, Henry Bowers, Lawrence Oates and Edgar Evans. South Pole Expedition, 30th March 1912.
No airfield close to location sorry