And with that, this thread is complete (which is not to say we can't do our own conversions of monsters converted by other unofficial sources).
In reading over dragon descriptions, all Dragon DR can be overcome with magic weapons. This even applies to dragons that are anti-magic, like the Cobra True Dragon and Arack LanDragon. Why not use lead (the anti-magic material)? Every adventurer gets magic weapons.
Or is there something I am missing?
Thank you for the find work on Dragons.
Well it quite a while ago, but the SRD Dragons only have DR/magic, so we were probably just following that lead.