Thought some of you would find this interesting..
These are the shells used by some of the well known tanks of WW2.. It's cool to see them side by side so you can actually see the difference in size, shell length, projectile type. Some of them look like big Centerfire cartridges on steroids.
Left to Right: 37mm German, 50mm German "short" (HVAP shot), 50mm German "long", 40mm "2 Pdr" British, and 57mm "6 Pdrs" British, with APDS.
left to right: 75mm USA M3 (Sherman, Cromwell, Churchill), 75mm German PaK 41 75L48, and 88 for the 88L56 AKA "The "88" "
left to right: 76mm British QF 17Pdrs (APDS shot), 75mm German Long (Panther and jagdpanzer 4), and 88 Long (King Tiger and Jagdpanther)