I have shot cast bullets out of my 357 and 44 mag. I got them form a fellow from Canton, Oh who sells them on ebay named "shootingamigo".
They are gas checked (he sells plain base too), and have been very accurate for my taste. They appear to be uniform in size, weight, etc. I like them. I also am trying a variety of jacketed, Remington, Speer, Magtech, Hornady, to see what my barrels like best. That's half the fun!!