RE: Which reloader is most cost efficient?
If you can't afford the Rockchucker, save until you can.....it's that good.
The cheapest reloader is the one you only have to buy once and gives you lifetime service....and that's the rockchucker.
You asked about powder and bullets....My preference is powder from Hodgdon and bullets from Hornady. However other bullet and powder companies are very good and don't have any fear of buying from them.