In my old days as a tank gunner, I had 63 rounds available for my primary weapon, which was essentially a single-shot semiautomatic. The secondary weapon was the coaxial .30 caliber or 7.62mm machinegun mounted coaxially with the main gun, and known thereby as the co-ax. For which we had 6000 rounds in the turret tray and an extra 4000 rounds in ammo cans for a reload.
Those old habits die hard. And in my case, haven't died out yet.
