These are loaded antique Winchester brass shotgun shells in 12

Winchester 12 Gauge 2-3/4 7 Shot Heavy Game Load - XU12H7

Blackpowder Shotshell Loading Tips - Shooting Times

Did anyone ever get any of the Winchester 12 gauge brass shells? : r/Shotguns

218 Bee Cartridge: History, Rifles, Handloads, Everything Yo - Shooting Times

Old shotgun shells hi-res stock photography and images - Alamy

Winchester All Brass Shotgun Shell - Ruby Lane

MAGTECH Brass Shotshells - Loading & Shooting How To - The Reloaders Network

8 Gauge Shotgun: Why It Went Extinct

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Winchester Limited Edition WWII Ammo 12 Ga 2-3/4 M19 Brass Hull 00

32 Gauge Brass Shotgun Hulls for 2.5 Chambers Box of 25