Thanks for the responses and the private messages.
One tip that was direct messaged to me, that I will post up here for all to see is to buy the 1/2 pint oblong cans from a site like this:
They are cheap (3 buck a pc) and you can different caps that are solvent resistant... also you can get the inner seal cap (BOTH CAPS come to about (0.25 $ total)
I really like this solution, because you can re-recreate the equivalent of a factory seal if you get the inner seal (one time use only) and lower your chance of a spill...
THEY ALSO FIT PERFECTLY IN A 30 cal ammo can...
Thanks again for the tip, phumpher