Well, it looks like your math is a little off and your geography more so. 336,000 rounds a year.
Steel from Ohio made into shells in Pennsylvania, explosives from Virginia and Tennessee; assembled in Iowa.
They are looking at building a shell factory in Canada (because who doesn’t want their ammo supply under the control of a foreign socialist government) with final assembly in Kansas and Arkansas. They do talk about a facility to be built in suburban Dallas.
https://www.army.mil/article/271572/strengthened_army_industrial_base_doubles_artillery_production
I thought the Tennessee facility had been closed; surprised to see it still in business. I wonder if the planned Arkansas location is the place where they make all the hand grenades.
Even using your figures that supplies the Ukes with 60 days of artillery per year. Call the Ukes, tell them back to Avdiivka! We are building the plant to produce the munitions you’ll use to defeat Ivan’s terrible threat TODAY. Are you trying to write comedy or does it just turn out that way?