this 7.62x54r brass fired by what gun？
VPT Valtion Patruunhetidas
( Valmet) Finland;
Corrugated chamber neck to assist extraction, SVT40 Soviet Samozdaradnia Vintovka Tokareva
( Self Loading Rifle, Tokarev)
Probably a Finnish Army Capture Rifle, Continuation War ( 1941-1944)
Thanks Doc, I would have guessed a fired crimped blank!
It could be also from a SVT-38. Both leave 14 flutes.