My Nephew's and I do the same thing. Bought a wide stand alone frying pan from value village for 5 bucks and drilled three holes in the side of it and inserted lead shot dripper nozzles that we had our cousin make up for us in his machine shop. They look exactly as these ones I found on ebay.
https://www.ebay.com/itm/Lead-Shot-...691003?hash=item1cba00adfb:g:ZdoAAOSwehVakE23
Played around on a Saturday afternoon to experiment with a wood shelf we made to get the correct slope and temperature of the lead. Honestly we were done experimenting in about 2 hours and the whole project took about 5 hours. Now the shot isn't perfectly round all the time but it is good enough for upland game and practicing. We should have done it years ago and now the hardest thing to do is find the components at a good price. You save a bit of money making your own shot but it sure is fun.
We make up a bunch of shot on a Saturday in the winter in my garage and it usually lasts us for the next year.