These types of bbs are air guns and NOT airsoft so logicaly you will want a forum or site that concentrate on these types of guns. Discussing them on airsoftcanada is likely to get you flamed. It's like talking about Honda cars on a Chevy truck forum.
Here are a couple that google (google is your friend) has provided.
http://www.airguns.net/
http://www.airgunforum.ca/
There are more out there, all you have to do is look and read...