Geoff,

Sorry for the silent welcome. You are right though, not many trappers post here. If you have any other questions about wilderness survival we can probably yak your ear (eyes?) off.

For trapping-specific questions I reccomend "Buckshot's Camp". The wealth of trapping knowledge there is amazing (at least to a trapping novice like me). He has a good article about 220 Conibears at:
http://www.buckshotscamp.com/Article-The-220-Conibear.htm

-Mark