I have never tried it myself but I read this article the other day about teal hunting. The author makes a pretty interesting argument about using nunber 7 steel for teal. He makes some interesting observations about shot count and the size of the pellets getting through feathers that I wouldnt have thought of.Teal die easy. Open chokes and 4 shot. No need for heavy guns and brutal loads.
Old school lead says 7.5 trap loads were used.