alanos said:
Well my archery skill is around 120. I use barbed arrows with +40 damage... I don't get it, really. When I'm in sieges with my other char my shield breaks after like 10 hits...
120 is low. Im assuming your shield skill, and your shield, are low/mid-grade also.
Keep leveling up, though dont expect to break too many shields with a bow unless you're a master archer with a master bow.