Did you try patterning them?
I did and they suck. On wild birds I like plated shot. My favorites are Federal Premium or Fiocchi Golden Pheasant. Bang for the buck the Golden Pheasant load holds great patterns in all of my guns and kills. I believe velocity in shot shells is over rated. It blows the pattern up. I stick with around 1200 FPS.
Federal Premium and Fiocchi Golden Pheasant have always been solid performers.
