I was able to solve my pure lead in the pot today. I went to Wal-mart and picked up a pack of stainless steel measuring cups. Heated the lead back up and poured it into the smallest container (1/4 cup) about 1/2" thick. Let it solidify and presto - round ingots of pure lead.
After the pot was empty i refilled it with the 13 BHN alloy and cast another couple hundred 340 gr bullets for my .45-70. I should be all set for a while now with bullets. I'm still working on a load for my .45-70 so that will chew them up.