If you are going to run bullets with this dipper, you will want more than just a lip for pouring. You want the lip to start down about an inch below the edge. This channels the lead, and gives you more control. To make a long lip like this, get a 3/8” drill bit, and open up your bench vise so the shank of the bit will easily pass between the jaws. Anneal the copper, and put the bowl on top of the open jaws. Now slip the drill bit shank into the bowl so just about an inch of it is in the bowl. Then just give it a couple of sharp smacks with a medium size hammer. The lip should be nicely formed.
I use a similar ladle for pouring nosecaps. I made it out of half of a copper float from a stock tank, and length of iron strap, riveted on for a handle.
Hungry Horse