If you can find the Win Super-X loads at the big box store in 16's, that's the ticket. Only comes in 6 or 8, 1oz, but is very soft shooting.

We usually go to Yuma every year for the dove opener and the first stop we make is WalMart to see if they have any 16's on the shelf. They stock some light 16's, but they are always sold out after opening day.