12 ga reloading isn't going to save you money, unless you have a cheap source of lead shot.
I don't shoot shotgun that much, but years ago, when a buddy had a MEC 600 Jr. he wanted to sell for a good price, I bought it. I've amortized the cost many times over and I get a kick out of reloading my own.I generally look for stuff to resell. But it is something I wouldn't mind adding to the bench.
I dumped everything but 20ga since that is what wife shoots. Buy bulk shells now for the tiny bit of shotgunning we do.
The cost is probably why I see them all the time for sale. Not saving anything by loading. Mec is what I've seen the most of.