I've tried a couple of ways to make some shot. Not shot for shooting in a shotgun, but shot for a shot bag to weigh down my "Lead Sled" rifle rest.
Here's what I tried:
1) Took a 5" piece of 2 1/4" black iron pipe, and threaded a cap on the end. Drilled a tiny (what I estimated would make #6-7 shot with) hole in the middle of the end of the cap (for the lead to drain out). Melted up a batch of lead in a dutch oven, and immersed the pipe assembly into the lead until it was the same temperature a the lead. I used a pair of ViceGrips to hold onto the pipe. I filled up the pipe with molten lead, and using a ladle to catch the errant drippings, moved the dripping pipe over a 5 gallon bucket and allowed the drips to fall into the bucket. It looked like the videos and sounded like them also. However, the result was very disappointing. What I managed to create were long, thin lead NAILS, which had very sharp ends on each end. I spent way too much time trying to figure out how to get rid of the sharp ends, and just ended up remelting the whole mess.
2) I did some reading, and saw that the commercial version o the shot makers have a short piece of steel plate that the shot stream falls on before the lead hits the water. Looks like it causes a secondary "splash effect". So, since my newer melting pot came in, and the old one was full of cold lead, I decided to heat up the old pot, and use the bottom pour spout to make the lead stream, and I fixtured a small steel plate for the lead to splash on before hitting the bucket. And, I was much more careful about the heat on this one, using only what heat was needed to get the lead to dispense. That way the lead stream would cool more instantly. Unfortunately, I got less pointy nails than the first try, but nails none the less. They were dull enough that I am going to use them in the shot bag for the lead sled.
The ones (shot makers) that you can BUY come with instructions and suggestions, something that I wasn't able to get anywhere with my Google searches. And, they are all designed for the proper results for makin very round, and appropriately sized shot. If you're only going to make 25-50 pounds of shot, forgetaboutit. However, if this is going to become a regular activity, then the cost of the shot makers is nothing, and you should just dive into buying a new one. They're only a couple of hundred dollars, and you'd more than save the cost of the machine in less than a dozen (25#) bags of shot.
Let us know how that goes for you. If you get it going, I'd pay you (50-50!) for doing some of my processing. I just need a few more bags of round stuff.