Some of the slugs in the bottom picture look like barnes expanders. I agree with the logic so far - the 12 ga sabot makes a nice sized hole (actually two of them) even without any expansion. On an ideal shot (broadside behind the shoulder) you will have two holes, an excellent bloodtrail, and no recovered slug. I had one deer hit this way drop and just kick a few times, otherwise they would go 20-80 yds and be lifeless when I got to them. My brother recovered a barnes expander from a frontal shot on a big doe - it looked just like the picture on the box. When I get my 20ga barrel, I will try fed barnes, rem ultra core lokt, hornady sst, and win part gold, and then use what groups most consistently. Shot placement it key after all. Keep in mind those top slugs came from dead deer, and I don't think win advertises perfect expansion like barnes does anyway.