I've done a bit of testing myself. Not sure if I've posted these here before or not. All test firing was done with a stock Mossberg 930 SPX.
Federal Flite Control 00 Buck @ 7 Yards
Federal Power Shok 00 Buck @ 7 Yards
Remington Express 00 Buck @ 7 Yards
Federal Flite Control 00 Buck @ 10 Yards
Federal Power Shok 00 Buck @ 10 Yards
Remington Express 00 Buck @ 10 Yards (hole marked P.S. was from the Power Shok target below this target)
Federal Flite Control 00 Buck @ 15 Yards
Federal Power Shok 00 Buck @ 15 Yards
Remington Express 00 Buck @ 15 Yards