Done that already...bought 6000 rounds not long ago...
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"Buy it cheap and stack it deep!" as the old adage goes.
I think most people are aware of the run up in munitions prices and some people theorize that it is based on metals demand, but even when metals prices (copper) plummeted, munitions continued rising.
Several years ago, when traveling along the Amazon river, I met an American who traveled the river extensively and he carried "shotgun" shells instead of Dollars. He informed me that they could be traded for a meal, a bed or even a night with the Chiefs daughter.
At the time, I thought it was just an interesting curiosity and filed it away in my head under "useless information". In later years when I became more interested in Fiat currency and was thinking what was small enough to carry, could be easily traded, and could protect itself, munitions was a logical answer.
If I feel the need to carry around larger denominations, hand grenades are easy to carry and are much less cumbersome on fishing trips!