“The range listed is for the missiles launched via the main gun.”
Holy Sheridan Batman. That’s been tried before.
The Russians love firing missiles out of the main guns going as far back as the T-64B and the AT-8. Older tanks such as the T-55 and T-62 have been modernized to have ATGM capability. The only Russian tank that doesn’t have ATGM capability is the T-72 even though the T-90 is actually a modernized T-72.
And they never get rid of anything, I bet they have depots full of T-34/85’s, IS-2, IS-3, T-10, etc somewhere east of the Urals.