Been using this load for 2yrs with shooters world powder on a MEC 900, 15grs. MEC #18 bushing , 7/8 oz. shot , clay buster gray wad ,Cheddite 209 primer .
Both myself and the wife shoot this load ,pretty mild . Might try going down a little in powder , also will load some up with 3/4oz. shot and see how it goes..
Scarlett has some load data on her web site about loading about loading Clean Shot in shotgun shells.
Willie