133 with Hevi is very low. Most of the Stardot talk is related to the 835, but I've hunted with one for years in a 870. It's performed great for me with lead and Hevi. With 3" Magblends I get average around 170 in the 10 ring at 40 yds, even though most people don't seem to like the Stardot in the Remingtons. I would expect similar results between the 535 and the 870, so 133 would not cut the mustard for me.