In Manigault,s diary (Siege Train) he talks of inspecting the batteries on James Island. In his inspection of Battery 0 in his entry of 31, Aug 1864 he mentions: "1 8in. Rifle double banded, 10 groves Saw fashion......
1 nondescript ("Hardin"), 29 8in Rifle Shell in magazine."
This is found on page 237.
Hope this helps.
Dan