I will add a couple of thinks I have learned about shotgun reloading, and shells for that matter. First, the Eagle branded shot from Peru? tends to run small, about 1/2 to 1 size smaller than Lawrence or West Coast. Second, bio targets tend to be harder to break than the old targets. The new "Blackout" bio's are the hardest of the bunch.
I am not a trap shooter, but am an avid sporting clays shooter, and have noticed these things.