Photos show some examples of early pre WW2 anti-tank cartriges
first photo shows 7,92x57mm, 7,92x94mm, 7,92x107mm Polish, 50 cal BMG and 55 cal Boys
the 7,92x94mm German and 7,92x107mm Polish are exact dummy cartridges
these cartridges fired a 7,92mm bullet around 245 grs at 4,000 fpsdscn2527.jpg