If you want to reload them for a hobby, go for it, but price out your components and tread carefully.
If you really want to reload those, check the shotshell load books for info. The loads are usually listed by specific hulls, as well as the other components. Stray from the recipe at your peril, if you are not able to work out the pressures and make load variations safely. Each hull has quite different internal shapes and using the load tfrom one style in another can either work out, or be a very bad thing.
The "standard" as far as hulls goes. seems to be the Win AA hull, and they tend to sell for about $10/100. Or you can generally pick them out of the bin at the range, for free.
If you don't need something special, like light loads or shorter shells, it's pretty hard to beat the cost of a flat of bog standard shotshells at retail.
Cheers
Trev