When you are doing large batches at once it's not that bad, I would load the pot and then go tinker with the car while it melted and then flux it once it was liquid, and pour it into the molds with the big iron dipper. Casting into bullets takes a lot longer as you are dealing with smaller amounts at a time, and bullets have to be perfect while ingots just need to harden.
I should point out one thing about modern wheel weights, they are not all created equal. Some are harder than others, different alloy, while some are not even lead any more but zink. This was brought to my attention by a mechanic friend of mine who just put new tires on his truck. If you find a supply from the 70's then it's going to be 90/10, but modern stuff can be that, or, 20/80, maybe 30/70, alloyed with antimony, or tin, maybe other things. Nothing stays simple any more. I have found some stuff that's very hard, counterweights of some sort, I will have to get a hardness tester one of these days. Soon will come the days when we will have to buy directly from the commercial lead suppliers to get the alloys we need. We are not seeing it come in as much as we once did, plumbers, and roofers don't use it, and now tire shops are getting away from it. Check old abandoned houses from the 30's and earlier ( with owners permission) you might find the water pipes and poo pipes are made of lead, yes, people once drank water that flowed through lead pipes.
Just let me know when you are ready Russell, and how much you need, I still have one and a half 5 gallon buckets full of the stuff.
I still have some left, but we are finally seeing the end in sight, one bucket is now empty, the other has noticeably reduced contents. I can still cook up some 90/10 regular stuff if need be once this current lot is gone.