Look like Red effect is visiting this site quite often lately.
What red effect is missing along with many Indian members here is......the reason why there is both Bustle & Carousel autoloader is because of safety reasons & less to do with carrying more Ammunition..... Having both has massive advantage & minor disadvantage as well.... Let me clarify.
Tanks like T-14 Armata with Carousel autoloader are still vulnerable since both propellant charge & Round are stored inside the tank. Which means in case of penetration.... turret of the tank will still go flying high due to catastrophic explosion & it's not guarantee that the 3 man crew in front will survive the massive explosion.
Furthermore the carousel autoloader limit the gun size as safety of crew decreases further, reason being if you increase the gun size you are also increasing the size of the Ammunition.... Bigger explosion in case of penetration.
Advantage of having both type can be a boon.......The Bustle Autoloader will carry the Propellant charge and the Carousel autoloader will carry the round..... So in case of penetration it will be turret which will face the brunt of explosion not the chassis itself..... This will also help increase size of main gun to higher caliber without worrying about crew safety.