Among the competitive clay shooters whom I know to use spreaders, the commercial favorite is the Kent. It's a stout load, 1 1/8 ounce at 1250 fps, and uses the "disperser-X" technology.
I can't say what the Fiocchi 1 & 1/8 ounce load uses; never cut one open. But 6-8 years ago I tried the 1 ounce on targets and doubted that it was spreading very much, if at all. Shot it on paper and confirmed it did not spread for me. Opened them up and found no reason why it would spread. It used a standard Gualandi wad with breakaway petals, but nothing I could see to disperse the shot.
Factory spreaders are a pretty expensive way to pick up a few X's, especially for "casual" clays. You can load your own for PW spreaders for about 75 cents more per box than your standard load.
