Shown next to a .22 Hornet....
Case length = 4.01"
Base diameter = 1.165
Neck ID = 0.780
No markings on base.
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It appears to be a case from a 20mm cannon .20 mm caliber - Wikipedia, the free encyclopedia
______________________________________________ Hellfire, Doom, Watch the hatred spin
Beyond the speed of sound---
Fire it up, Let the engines roll
It's time to burn it down
I got that guys bigger brother on my desk. A case from a 30mm shell that was shot off an A-10 Warthog.