It is nice to be able to use off the shelf, easy to find ammo like Estates or Gun Clubs (my favorite, because they reload very well, both 20 and 12). I love RST's, which are somewhat more expensive than even premium target loads. They're on the dirty side, but I don't mind. And if you're looking for a good pheasant load at a reasonable velocity and a reasonable price, the 12ga 1 1/4 oz RST's are a good bit LESS expensive than Win/Fed/Rem "premium quality" pheasant loads. (And the latter are also, IMO, a whole lot faster--therefore more recoil--than lead hunting loads need to be.)
I guess there's just not enough interest for one of the big ammo makers to produce low pressure, modest velocity target loads with light shot charges for those of us who shoot vintage guns. If they did that, I think a lot of guys shooting modern guns would probably use them too: reduced recoil.
