It’s been quite a long time since you asked this question.
Did you ever find information?
If you are still interested, let me know.
William A. Hesskew is my family member also. His daughter (Mary Jane) married W.C. Billings who was a 2nd Lieutenant in that unit. These two are grandparents to my grandmother, Ruth Billings Claunch...whom I was very close to.
I grew up with the journal W.C. carried with him during the Civil War, and have done a little digging into the Wilson Rifles, who were also known as the 2nd Tx Infantry, and also to my understanding, the Texas Sharpshooters.
Katherine Claunch Moore