Re: selling reloading supplies at flea markets?
Yes, you can. Reloaded ammo falls under the Excise Tax for it and to do that you must not only have an FFL 06 (or 07, but IIRC it's an 06) and you have to pay the taxes.
I called the ATF and verified this 2 weeks ago. As long as it's not Black Powder you can sell powder, primers, cases, bullets, primed cases, etc. Once you put case, primer, powder and bullet together it becomes ammo and you can get your ass in a crack.
If you have any further questions I strongly suggest you get on
www.atf.gov and look up your local field office and call them.
As much as I don't like their agency, I have to work within the rules and have come under the mindset of "hi, I'd like to do this, can you tell me what legal issue would arise? I don't want to get in trouble, so I'm asking before I do it."
They're generally more than happy to tell you not only the answer to your question, but how any minute changes in that scenario can get you into trouble.