I have some of them and have caught coyotes and once a fisher (that was interesting to get out with my body intact). The trap jaws actually just hold long enough to allow the snare to slide up as the animal pulls back once the trap is clamped. There is a video on u tube that shows how to set them and an artical recently on the ATA web site (I believe thats where I saw it) on setting them. I don't have any other tips....sorry.
Got thinking and hear is the link, it is in september.
http://www.albertatrappers.com/infor...wsletters.html