If anyone wonders why Russian artillery ammo is not running out as fast as predicted...
I wasn't wondering. Mostly I'm wondering how long the Russian barrels will survive. Estimates range from 15-30% of that ammo is bad (duds or misfires), and sometimes a misfire looks like a dud until you poke it wrong.
Russia has a definite advantage in towed artillery other similar 'dumb' artillery. It's one reason Russian manufacturing is pushing to more rocket artillery. You don't really have to worry about barrel wear, and a single unit can put out a large volume of fire fairly quickly. It's just getting more and more inaccurate. So we're looking at more of an old style, cold war era game supplemented with loads of remote spotters. Makes corrective fires more accurate.
Downside there is that it requires a great deal more time to get follow on fires on target. This leaves Russian artillery much more vulnerable to counter battery than Ukrainian's current inventory.