To the OP, I'd recommend cast boolits, or shotgun world. I've done alot of research on the shotmakers, and the people who use them can be found on those two forums.
There are many owners of littleton shot makers, and also there are a number of people who've made their own shotmakers. It's really just a hot tray, and some nozzles screwed in the sides.
It's not complicated. Lead dribbles out of nozzles onto a short trough usually coated with powdered graphite and rolls off that into a bucket filled with either liquid dish soap, or automotive transmission fluid.
Both are thick enough, and cool the shot slowly enough, so that it makes fairly uniform globules.
Then you collect the shot, clean it, sort in by pouring it through screens, collect the sizes you need, and put the rest into the trough to remelt, and use again.
Now, if that sounds simple......it is.
But there are caveats, just like anything.
1. Temperature is everything, the lead is small at first, but as the shot heater heats up, the lead starts dribbling out of the nozzles faster, and can stick together, and can become larger.
2. Size, roundness (or lack theorof), and hardness can change as your coolant heats up.
3. Coolant soaked shot is messy.
4. The different lead alloys (pure lead, lead from wheelweights, unknown scrap lead) etc..etc.. change the characteristics of the shot that the shotmaker throws, size and shapes.
5. Round is relative, it's not uncommon to get alot of flattened, or teardrop shaped shot in your shot. If you want it perfect, you have to do alot of fiddling with temperature, distance to coolant, etc..etc..etc...
6. There is a maximum size for homemade shot, made with a littleton, don't expect to make any BB sizes!
7. Patterns won't be perfect, like with perfect shot from the factory, this is really important to some uptight anal kinds, or the kind of person that is trying to be really competitive. This shot seems mostly popular with the fungunners, and those people who shoot the shorter range clay sports.
Now, at the end of the day, you will get to spend some quality time in the garage, tinkering, and you will be able to load shotshells for a small fraction of the cost, and alot of people will turn up their noses at your slightly funky looking shot.
Do I want one? YES!!!!
Can I afford one in university? NO
, besides, I'm just not shooting enough clays to justify it right now, and I live in an apartment, so it's just not in the cards. I'll have to be content with boolit casting, and loading from bulk shot.
P.S. What I heard alot of is that the guys who are using these can afford to shoot ALOT more than their store bought only friends, so despite the small advantage given by the perfect shot, the guys casting their own can pulverize clays like there is no tomorrow and just switch to factory shot for competitions.