Well I just found this web site that says the reference for the burst Whitworth is at....
28. Warren E. Grabau, Confusion Compounded: The Pivotal Battle of Raymond, 12 May 1863 (Saline, MI: McNaughton and Gunn for the Blue and Gray Education Society, 2001), 35; Official Records, Series I, Vol. 24, Part I, 738.
Here is the web site.
I checked the O.R. reference and all it says is "a" gun burst. I don't know the other references.