The specs for the ammo are too specific. It stipulates a specific bullet be used in say the .40 S&W.
Switching from a bullet for 357SIG to 40S&W isn’t a big deal (maybe more than trivial, with some tuning to get it running right).
I’ve been in a factory with dozens of these machines, and seen them in action. They’re impressive. The owner likes to say that when a machine is running, it’s going (as fast as you can say it): “nickle-nickle-nickle-nickle...”
The fed govt buying this specific ammo in this limited number of cal wont have any real affect on the overall supply of ammo for any real period of time especially if it’s over a 5 year period.
The govt isn’t buying this much ammo to try and affect the supply of ammo as some people are speculating.