It's not a forum but PyramydAir hosts a daily blog (5days a week, even on ALL holidays). There's a LOT of info in the comments section, you can ask off-topic questions and you won't get shot down in flames there. There's a guy in Russia who designed and is making is own airgun from scratch, a few guys who can fix all and every airgun out there, another started a range, holds and participate in big FT matches. It's a nice place to be online.
I tried the yellow and other forums and I can't stand it either. I come here on the other Canadian Forum and the PyramydAir airgun blog, that's it.