I've used just about everything under the sun. TSS is the best for consistent, clean kills at any range, but is too pricey to use for anything other than special hunts. Fed Heavyweight at 15g/cc is a close second (I just used some #6's to pass shoot big honkers and it's deadly). I also used a lot of Bismuth this season - worked just fine. HW13 is another personal favorite. I still shoot quite a bit of steel, particularly on opening morning when there are a lot of teal around. It works just fine, but I do notice an increase in the number of birds that require either swats or ground chases. A couple of places where I hunt have particularly heavy cover, so I always use high density products there to minimize lost birds.