Seen another way, the estimated rounds required to accomplish a given mission suggests Soviet artillery theorists did not see their weapons systems as highly efficient -- i.e. estimated rounds are what was required, not some happy intent to overkill a target.
There was a great deal of speculation back during the Cold War that the Warsaw Pact could only sustain combat operations for a couple months at the intensity level their doctrine called for. With what the Chinese front was drawing off in terms of units and resources, I'd suspect that the Soviet forces on the Western Front (before the nukes freed up troops in the east) weren't able to expend ammo or anything else at the level specified in doctrine.
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