I am having some trouble connecting your thread title with your question.
I shoot clays quite a bit with my '55 Wingmaster so I consider it a "good sporting clay gun" for me. It fits me well and I do OK. I use the shells that I buy at the club which are Estate #8's.
I probably would not use the Estates in a gas gun though as they seem quite dirty. No problem in my easy-to-clean 870 but too messy in my 1100.
For the gas gun, I will spring for Winchester AA's but I do not use that much for SC.
My father's SC 1100 eats AA's regularly though and, since I clean it, I can tell you that they work well and are not especially filthy.
Mike