Here's a link to Hodgdon Powder Co Youth loads. Scroll down to the bottom for the shotshell loads. There are 3/4oz 12ga loads in WinAA and Rem cases using Clays powder. They use the Fed 12SO wad in their load. I've used this exact load and also subed the Claybuster equivilent for the Fed 12SO for cost sake. I also have used this load with the Claybuster 1100 wad ( a Win clone) and have had excellent results but cannot tell you or advbise what if any pressure differences occur. The printed load is low enough pressure I felt to allow my substitute but it's my call there. I've fired thousands of these and find them perfect for me and the older guns I use. Cheap too!
I have lowered the shot load down as far as 9/16oz w/ a popcorn filler but thats about as far as you can go and you start to get some imperfect combustion,,but they still break birds. Back up to about 11/16 oz now.
http://www.hodgdon.com/PDF/Youth%20Loads.pdf
