The ones that come with cad in the sample tool palette Civil/structural,
are they cosher or approximations?
I'm looking for Channels as well, but cant find any decent info on them.
very un-kosher. many are simply wrong in size, and plus they don't even have most of the common sizes we use!
I'd do a search on the autodesk newsgroups for this, (possibly here as well, haven't tried it here so I dont know) for a solution. There are many out there, though not always a dynamic block. I use a version of Al's Steel Mill for most of my stuff (non-3d) which makes all WF, M, S, C, MC, and all those cool AISC shapes, imperial and metric. My only beef is that it's pipes doesn't list Schedule sizes, only STD, XL, XXL or whatever... we still use schedule nomenclature.
Anyways... I would strongly advise AGAINST using the supplied dynamic block because it's crap.