20ga 3 inch steel reloads

Just got a hold of some new 3 inch chedite cases in 3 inch 20ga , i have not loaded any 3 inch steel in 20 before what wads are available and what sort of shot weight can you get them to hold, can they load 1 1/8 oz in the 20 with steel or are there just wads for 1 oz? Any load recipes i should look at.