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

what is this part of the bullet called and is it called the same for that part of a artillery shell? : r/Militariacollecting

Need help identifying this 3 shell, please (Added information on 3 inch cartridge cases) - General Ammunition Discussion - International Ammunition Association Web Forum

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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Need help identifying this 3 shell, please (Added information on 3 inch cartridge cases) - General Ammunition Discussion - International Ammunition Association Web Forum

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Artillery Shell Casing - Canada