Well, I have been casting for a day or so now, danger if I haven't learned something new again.
Here is a question or an issue I have run across.
Will the tin seperate after it has been mixed? I ask because I have weighed out batches of alloy, melted all, stirred, fluxed, stirred more, then go to casting. All is well for this.
Then at a later date I will start off by filling the pot with sprues then stir,flux,stir and cast. The alloy sprues refuse to cast well till I add a bit more tin.
Had this happen on my Lee 20lb pot, then I picked up an RCBS pot, it still happens but doesn't seem as bad. I thought it may be a temp issue, but that doesn't seem to be an issue as I tinkered with it. In the past it seemed if I fluxed that would straighten it out and it worked fine. Not so much anymore.
As to stirring I have a buddy that uses a cordless drill with a length of all thread and a modified fender washer to get a good stir on it. He started using this when he was chasing harder bullets and adding antimony. Of course one want to use a lot of caution here and dang shut don't pull it out while it is spinning.
Jeff