Agreed. I have a healthy stash of silver rounds for exactly that purpose. Gold is the better insurance metal. But silver is what you need for day to day expenses. My only quibble with junk silver is I don’t want to have to explain to every store clerk that yes, pre-1965 US coins were made of silver.
If silver becomes a bartering currency, every store clerk will know what the various types are worth. Private mint rounds might not be accepted, but the stuff with government mint marks will probably be known.
This would only happen in the event of a complete failure of the dollar and the electronic credit payment system.
And, it probably wouldn’t last very long, although it would seem a long time when you need essentials like food and fuel.
There’s a history of failed currencies being replaced and re-established after hyperinflations. It’s messy, and it only follows episodes of economic devastaion, but its been done. Some examples are Germany, Hungary, and several Latin American countries.