The Soviets did not have good experiences with storing ammo in the back of the turret in WW2. The BT series of tanks and the T-26 used to store ammo in the back of the turret.Carousel autoloaders absolutely suck. There's virtually no benefit to using them over a bustle autoloader. They're also responsible for the jack in the box effect while it's possible to install blowout panels with a bustle. It's unfortunate that the 99 uses carousel.
It was found during Barbarrossa that the Germans would easily disable those tanks with infantry using satchel charges on the bustle ammo rack. Once you blow up the ammo, the tank is pretty much disabled. And the tank crew become targets for the opposing enemy infantry. Tanks which stored ammo in the armored hull were not nearly as vulnerable to satchel charges.
Since then the Soviets and the Russians have basically eschewed using bustle ammo racks.
The last Russian tank design which stored ammo in a bustle ammo rack was the Black Eagle. But the design was rejected by the Army brass precisely because of that. More recently the T-90M does have ammo storage in the back of the turret but the ammo is outside the turret.
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