I sure agree to the quality of Jeff Tanner moulds. And at a price that is sure user friendly. But hardly a bag mould.
Absolutely not a bag mold, but if you need a diameter not otherwise available or just a good mold that won't break the bank, Jeff's your man. I have one of his molds in .480". It cost less than $35 shipped and got here in about a week. They do require that you supply your own handles. Lyman small work like they were made for Jeff's molds, as do Lee's six banger handles.
I've also got a Dixie Italian brass mold in .490" that I bought twenty years ago or more. It drops a ball as round as my Lyman .440 or my Lee .490 and .390 molds. So if Dixie has your diameter, I can only say good things about them from my experience.
Three Hawks