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I guess not that many people stack other metals than Gold and Silver. Even the fairly expensive ones like Platinum, Palladium or Rhodium are not very popular among stackers. And those are way more expensive than Silver.
When you come to metals like copper, you really need substancial amounts to store a significant value, which takes a lot of room and is a serious pain if you have to move it, for example. Lets say a 10.000 dollar copper stack - how heavy would that be?
Of course there are a few lesser known, but more valuable metals. Like Tungsten for example or Chrome, Mercury, Vanadium ect. But they are still cheaper than Silver. And even Silver (at todays price) can be quiet bulky.
There is however the alternative of "Rare Earth" metals. Some of which are very expensive - even way more than Gold. But they are difficult to get, and there is a risk that a new technology could find a cheaper replacement for the stuff you own - and then its suddenly worthless.
Or you could buy 1 gram of Tritium gas for a couple of million dollars. Then you have a cool night light, at least. :)

I do have a few copper rounds and a pound of a copper art piece.

Thank you for your continued support of SteemSilverGold

We love copper, we stack it and we love to pour it! Copper art is amazingly beautiful.

I have a few copper rounds but I only really bought them for the designs on them.
It's so much harder to see real ROI on copper because you would have to stack quite a lot of it since it's bought/sold per pound instead of by the ounce. 

Something that might not be a terrible way to stack some copper might be copper wire. If copper goes up wire will too and it could also be useful in a SHTF situation.

I buy copper rounds for unique designs.  There are some limited edition silver rounds that I like from Silver Shield.  Some of these silver rounds have a unique and impressive design.  In this case, I get as many silver rounds that I can get.  Then, I get a few of the same design in copper because it is also a limited edition. Basically, if I believe the design is good, then it is also good in copper.

I will have to look into the base metals @silverbug, I haven't really thought about it before thanks for that.

I have lots of copper wire and piping from going out scrapping, it's free money.  :o)