You could Google (search words):
= = International Ammunition Association = =
There, 'click' = Cartridge Collectors Forum =
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Also, just go to a Gun Show, and ask around if anyone's interested? I found a full box of Kanuk .32 rim-fire shorts, and I inquired about it at some 'tables' selling old ammo ... and every 'seller' I talked to wanted to 'buy' - including a guy at a table who only displayed 'new' ammunition.