The mortar I found 75mm HE shell from WW2 identified as the round

Unusual mortar body - General Ammunition Discussion - International Ammunition Association Web Forum

75 to 87mm Ammo

WTS: US 75mm M72 Armor Piercing Complete Round - G503 Military Vehicle Message Forums

My WW2 75mm Sherman Tank Artillery Shells: The Clean-up

WW2 German, Soviet, Allied militaria, uniforms, awards, weapons history. War relics forum

75 to 87mm Ammo

1943 Military 75mm M18 Sherman Tank Projectile

WW2 British Artillery Shells and Mortars – Colours and Markings – Stephen Taylor, WW2 Relic Hunter

What was the point of changing the Sherman's gun from a 75mm to a 76mm? - Quora

U.S. WWII 81mm Mortars in the - Quest Masters Museum

Got this from my grandfather, very heavy, looks like a mortar? : r/whatisthisthing

WW2 British Artillery Shells and Mortars – Colours and Markings – Stephen Taylor, WW2 Relic Hunter

Ordnance QF 75 mm - Wikipedia