aeronca,
I had to do a search to find out what all that 7AC, 11AC and N86313 stuff meant before I could answer your posts!
I thought you were talking about some kind of reloading stuff I had no clue about. There is plenty of stuff I don't know about reloading, but I thought I was really behind the old eight ball on this one!
At any rate, to answer your first question about casting. I started out doing things just like you. Load the pot, flux, pour. What I got was frustrated. I use Lee bottom pour pots and they were always "leaking" when I did like you. Not that that is solved 100% by doing what I do now, but it helps.
I use a turkey fryer burner with a cast iron pot to "smelt" my wheel weights now. Much easier to separate clips and flux this way. Then I make ingots and store for future use. Keeps my pots cleaner when I want to make bullets. Lets me make more bullets in less amount of time, kinda!
As for price, I get 5 gallon buckets for free when I get my work van serviced. I have paid from $10 to $20 per bucket before though. I ran into a sweat deal awhile back. A local tire store's recycler contract expired and the new one wouldn't pick up any wheel weights that were left in the old one's buckets. Right place, right time, got over 500lbs of wheel weights for $30.
Needless to say, I haven't gotten all of them converted into bullets yet!