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I do not know for tanks, but for artillery, it tends to be much higher (few thousands) It is quite variable depending on if you re firing full charges, firing when the tube is hot, etc.

Yeah, the exact number is probably classified and precision does fall off with use.

The M1 Abrams, along with many other modern tanks, has a smoothbore cannon.

The only NATO tank with a rifled cannon is the Challenger 2. The Brits preferred HEASH ammo, a rifled cannon improved accuracy. It took some development to get HEAT and SABOTs that can be fired from a rifled cannon. No idea what the Russian tanks are using.

EDIT: Just looked, the T-72 has a 125 mm smoothbore cannon.

Current models do, but the original M1 and M1IP were armed with the M68 105mm rifled gun (basically a licensed British L7).

All Russian tanks are smoothbore...