just picked up this monster shell casing and I'm at a loss for what it's from. Diameter is 5.5 inches or just under 140mm but it has no markings on the base.
![](https://preview.redd.it/just-picked-up-this-monster-shell-casing-and-im-at-a-loss-v0-3flrx2yyepea1.jpg?width=640&crop=smart&auto=webp&s=916aad9012b537bbcebb0537e48621f7dad2fdbd)
![](https://i.redd.it/just-picked-up-this-monster-shell-casing-and-im-at-a-loss-v0-3flrx2yyepea1.jpg?width=4032&format=pjpg&auto=webp&s=a4221d23c354ef9a08f2cd0b826bd613855a694b)
just picked up this monster shell casing and I'm at a loss for
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