Is it a .25 cal?
Is it 9.3 X 72 R ?
yes 9.3 it is mate!
Your go.
Bad Photo, but the remainder is straight walled- 
Same patent, but unknown size.
So I jumped the gun a little above, the last one was actually 9.3x74r.
All good.
Is this current one a developmental shotgun shell?
Its a commercial shotgun shell, not current though.
is it British?
I believe it is American.
DRAPER CARTRIDGE - Actually a misnomer, these are really Wills Patent (#45,292 of 11-29-1864). A screw-off base reveals a percussion nipple. Several dozen variations are known in various calibers, lengths and base styles. A few (rare) rifle rounds are
also known. The bases are marked "Patented Nov. 29, 1864 F.D. & Co .
http://cartridgecollectors.org/?page=glossary
Yes it is a Draper, but which one?
is it 12ga?
No not a 12 gauge.
is it measured in ga, as opposed to mm or .cal?
Yes it is a gauged size.
Ok then, well 16 was a pretty popular gauge back around the days of shotshell inventyness!
Not 12 or 16, but I think you should have it anyway - 10 gauge ( which would come up soon) as no one else seems interested.
Thought it may be of interest to you with your 12g brass case development.
Reading all this stuff is interesting but i have had no idea the depths that these two threads have shown. only by googling some of the hints have I ever been made aware of the existence. Ignorance has been bliss.
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@sungazer, There sure are some weird and wonderful things out there and the development that went into a lot of them needs to be appreciated.
