Schwerer Gustav railway gun at Sevastopol - WW2 HistoryBook

Schwerer Gustav railway gun in a rare photograph, likely sometime during 1942 at Sevastopol, although this information can not be 100% confirmed. Schwerer Gustav was the heaviest mobile artillery piece ever built and the largest caliber rifled weapon to ever be fired in battle. It weighed almost 1350 tons and could fire 7-ton projectiles up

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Now that's what I call a gun! AnandTech Forums: Technology