Unfortunately, the guy with the ammo is going to rob the guy with the gold.
The problem with ammo is that it has to be stored. Think about it this way:
A Double-Eagle is about the size of quarter, and it can be carried just as easily and anonymously.
How much effort will be required to carry $1900 worth of ammo?
If you have too much, then you will be forced to defend it. What did Patton say about Fortified Defenses?