My favorite ladle is a very large and long aluminum spoon. I think I found it in some of my camping stuff, probably handed down from a couple of generations. It's like something you would find on a chuck wagon, used to feed a lot of ranch hands or a group of hungry hunters. I dented one side to make a pouring spout. It holds a lot of lead at a time, so the lead stays hot as you pour. And it has a long handle to keep the user away from the pot and the heat or any potential accidents.
They are fairly cheap at big box sporting good stores. If you use one of those commercial melting pots, it may be too big to work efficiently though. Maybe something in between a large and small spoon would be available. And as mentioned before by our own Miss Cynthialee, once used on lead, it can NEVER be used for food again.
All regular silverware (except for the fine silver) is made from stainless steel, lest it rust and corrode from use. If you find a cheap SS spoon that works, by all means use it. Look for something with a long handle, you'll love it. And you may want to take a cold chisel and hammer in a pouring spout on one side. Check flea markets and yard sales. Good luck. Bill