Haven't used my 16 for CAS for years.... But when I did I used Circle Fly wads, 1 1/8 over powder + 1 felt + one over shot, 1 1'8 oz shot, and varied the powder charge to make it all fit in the shell right. I was using mostly Pyrodex then for shotshells, only because you could get it cheap on clearance after deer season from Wally World. Don't remember the exact load anymore. I used the cheap black Remington hulls, they only lasted a couple of reloads before they got to burned up to use, or the Pyrodex caused the steel case heads to rust. Also, best to de-cap them immediately when you get home, otherwise they can be hard to get out due to corrosion.