It is about rate of fire. The 2S35 has a higher rate of fire than basically any other artillery system currently out there.I don't see any difference between 2S35 and PLZ-05. Except the PLZ-05 is 10 years older and 100s were produced vs only 12 for 2S35.
You have to remember to achieve that kind of rate of fire the Russians initially wanted to use a double barrel system. But then they figured out a way to get a similar rate of fire with just one gun barrel.
It uses microwave ignition with its own special propellant. It also uses some kind of proprietary barrel cooling system.
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