The Winchester AA's are by far the best. The STS's will give you about 1/2 of the reloading's that the AA's will give you. Nobody, I mean Nobody reloads Federals in the sub-gauges.What shells would be good to reload?
The best powder to reload them with is 20/28 as well. Unless you want some 1,300 fps loads in Sporting Clays. Then Longshot powder should be better.
If you can hold off until April? Winchester should have there 2 dollar rebate back at that time. You can get 2 bucks off a box at that time. Just buy one case to hold you over until then if you need too. I hope you enjoy the 28 ga. as much as I do. It is by far my favorite gauge to shoot. Enjoy your Journey into the 28 ga. break em all Jeff