First of all, the problem is, according to the US intelligence back in Nov 2022, Russia is using 20000 round a day.
Russia has lost a lot of equipment, including helicopters, and some of its fresh troops are arriving at the front lines without weapons, say officials.
www.nbcnews.com
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That's
7,300,000 round a year. So, setting aside the fact that Western Doctrine is not Artillery intensive (as this is actually the least effective option in war), hence the low number in the west, Russia production is not really enough to sustain their own usage for a year, less than half a year to be exact. Actually this is a piece of alarming news if you are Russian.
The issue with Artillery is, you have to fire a whole lot to achieve saturation, and it's pointless to use against hardened structure. For example. 12 152mm guns would need to shoot all their assigned ammunition (50 per) to cover a 0.3 square kilometer (300x300 meter box) and then it wouldn't be enough to destroy that square completely. Meaning whatever you wanted to kill will probably still active after that round of 600. The Western Doctrine would have used a single or a couple of missiles/JDAM to engage that target, instead of firing 600 or more artillery round.
On the other hand, you can only engage a very short distant with Artillery (<50 km) so regardless of how many round you shoot, whatever outside that range is safe and it's prone to counter battery fire. Which the latter was not at all active because the US withhold the aid for more than 6 months.
Comparing artillery round made between the West and Russia is not really showing anything. What you need to look at is how they use them and their progress, the reason why Kharkiv Offensive (2024) is the "best" advance the Russian had in the last 18 months in itself showing the deficiency of the Russian military. Given the fact that US withheld their aid when they account for over 60% of Ukrainian supply and the fact that Ukrainian leave the border open is a strategic mistake.