Well, if you aren't talking about artillery tactics I'd recommend these:
Jones, Charles H. (2001) Artillery Fuses of the Civil War (O'Donnell Publications, Alexandria, Virginia)
Melton, Jack W. Jr. (2018) The Half Shell Book (self-published by Melton under Historical Publications, Charleston, South Carolina)
The Jones book is very hard to find and will set you back if you find one but it's the bible. The Melton book is expensive but readily available from Mr. Melton; it's a wonder to behold.
Two others I think should be in a good library are:
Hazlett, James C., Olmstead, Edwin, and M. Hume Parks (2004) Field Artillery Weapons of the Civil War (University of Illinois Press,
Urbana and Chicago)
It's a classic and has lots of pretty good illustrations and useful appendices.
Cole, Philip M. (2002) Civil War Artillery At Gettysburg (Colecraft Industries, Orrtanna, Pennsylvania)
Obviously it only covers what was at the one battle but it's pretty good.
And one other that I've always liked that has some good chapters on artillery (field, heavy, and naval) is:
Coggins, Jack (1990) Arms and Equipment of the Civil War (Dover Publications, Mineola, New York)
It's compact and more of an overview but it contains a surprising amount of information. It's also nicely illustrated by the author's pen and ink drawings. You can find a good used copy easily and they're cheap.