Think this may have a slight impact on ammo prices but I may be wrong.
Copper is, of course, used in nearly all munitions production. We import copper to make artillery rounds, missles, mines and bombs, not to mention small arms ammunition. Copper is also critical for anything electric. It’s the cheapest good conductor there is. And it’s all imported.
They tried aluminum, which is cheaper, but it’s not nearly as good or useful conductor.
Prices of copper are at an all time high already - $5.51 per pound. And copper thieves have been very active the last year or so. Raiding phone company cable and building suppliers.