i posted a copy of the US artillery manual for the civil war period on the forum before. it mentions bar and chain shot only in passing, for naval use. it goes into great detail on all other civil war era projectiles, their wooden sabot, the tin bands used to hold same to the shot, pre-made cartridges, etc. etc. worth doing a search for & reading it.
Linky to Gibbon Artillery Manual of 1863
the full 1862 army ordinance manual, scanned, is available thru google books as a .pdf if interested... it's too big to attach here. (19MB) it has sections not only on artillery, but small arms and horse saddles, and tackle, swords and bayonets, etc. and also tables on ballistics and on 'foreign' ordinance.
Linky to google books ord. manual
(click the .pdf item upper left to download)