Tariffs and metals prices are short term issues. like fruits and vegetables, Walmart just buys from somewhere else when a weather event shuts down imports. When there is a change in flow or supply, somebody else steps in to make money. Not to worry.
I was told the tariffs would effect my 401K, That is true. It is higher than ever before since the tariffs. I am up a solid 23% just since January 17. If it continues I would be above 40% for the year. Half my investments are blue chips, leading companies. It is the big company stock that tells us the risk or comfort level of the market. I do not worry about the price of copper.
That said, short term panic is always real. There is nothing wrong with buying bulk ammo or bullets and stocking up, until any such issue passes. Guns and ammo, except collectables are not investments, however, if you are eventually buying ammo anyway, buying cheaper in advance, is a hedge against both real inflation and and price inflation based on fear.
But then for those of us who reload, and cast, powder coat solves most of those issues and is much cheaper at least for handguns.