We're wasting billions and depleting our own stockpiles and that is endangering our national security in the event we need to fight a war that does involve our national security.
Watch the video.
The capacity, and stockpiles, are there, way beyond the likely needs of a hypothetical continental land war - because this IS that continental land war.
That is also why countries in Eastern Europe have risked large drawdowns of their own stocks - because this IS the main event.
Those stockpiles btw are wasting assets. They need to be replaced with new tech and new materiel.
Depends, Both the Ukrainians and the Russians are spending several times their current production of shells and other munitions. Ukraine is getting resupply from NATO and other countries, who will be several years rebuilding their stockpiles. Russia is consuming their stockpiles that may date all the way back to the end of the second world war.
Shell shortages are not a new phenomenon in war, in 1915 all participants in WWI had fewer shells than they wanted. Once the pre-war stockpiles are consumed both sides will be limited to production rates for shells, and the production rates will be a moving target.