case

Aluminum and steel are the only other materials used for cases that I'm aware of, neither of which is typically reloadable. Most major advances with metallic ammunition cartridges were made over 100 years ago, all that has happened since then is slight tweaking and better manufacturing technology. If there were a better material, I'm sure we'd be using it.
 
How many firings do you want? I have some .308 cases that are over 20x fired. Neck sizing works wonders...
 
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