hi I've had this large brass shell casing for quite a while , obviously I know what it is ..but I dont know what kind of artillery piece may have used such

Been seeing the bolter rounds are the size of a Red Bull can a lot recently, so made a scale for .75 cal as accurately as I could. : r/Warhammer40k

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Can somebody tell me what this shell casing is from? : r/guns

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, Item Number: , 1511-36749, Item ID: , 2276, Category: , Casings

Brass Post War Mortar Shell Casing c.1963