Just two minor bug reports i put in today, but the T55AM-1 and TO-55 both have 7 DSkh magazines present on their models, but only have 300 rounds of ammunition. The DShk ammo box contained a belt with 50 rounds a pop, so with some simple math both vehicles should have 350 rounds of ammunition like the T-55A currently in game.
TO-55: Gaijin.net // Issues
T-55AM-1: Gaijin.net // Issues
Screenshots for those curious: