I have a 536 and have taken quite a few animals with it so far. I have a smaller place and have box blinds set up in 2 of my fields. In one field most shots are 100-180 yards to feeders but this sow was with a group a couple of weeks ago that were skirting the edge of the field and not coming in. I popped her at close to 200 yards.
The other field has feeders at 80, 100, 180 and 220 yards and I’ve taken hogs at all of them. I tend to forget about the zoom feature and take most of my shots on 4x. This boar was Saturday night at 150 yards.
The coyote was at 80 yards.
I chose the 536 after much discussion regarding the type of hunting I normally do (stand vs spot and stalk), but I have had some luck stalking too. It helps that I know the distances well based on familiarity, but the 536 is good at most distances I can encounter on my place. As the weather gets hotter, I move to shooting them off the front porch and those feeders are 200 and 300 yards and I’ve killed several at the 300 with the FLIR. It’s a great scope. The more you see through it, the better you’ll get with guesstimating.