Germany (by itself) is apparently out-producing the US artillery shell production.
* https://www.newsweek.com/germany-overtakes-us-in-ammunition-...
Russia's GDP is below that of Italy (and barely above Canada, who is in NATO):
* https://en.wikipedia.org/wiki/List_of_countries_by_GDP_(nomi...
If the Europeans really want to, they could produce a lot more by converting over to 'war mode'. Certainly they need to do more with current geopolitics, but there is no need to crank it to 11.