By federal law IIRC, 10,000 primers is all you can have stored in one location on hand...ie your house. Some cities may have other additional restrictions. You can have up to 20 lbs of powder stored in a residence without special storage requirements. Build a wooden box to specs and you can keep as much as 40-50 lbs if my memory serves me correct. I try to keep the maximum amount on hand at all times! The federal storage limits are for safety reasons in a personal residence and not just an arbitrary limit dreamed up by some law maker. DO NOT store them together or in close proximity to each other. Store them in different cabinets if in the same room although different rooms would be much more preferred. That last tip is coming from someone whos had 21 years expirence working with explosives at weapons facilities and weapon depots. Just a suggestion...
As for the second question...I would not be bartering ammo or anything else that could be used against me to great effect.
As for the second question...I would not be bartering ammo or anything else that could be used against me to great effect.