If possible try the 330 what I have found was the other traps just didn't have enough also chain and stake the 330 if you get an undesirable catch they will leave. In my experiences they are one tough prairie bear. Also are you allowed to use a 22lr
Link to a previous thread if you can keep pets away this works but red is right cover it up.
http://www.outdoorsmenforum.ca/showthread.php?t=215591