David, if it's any help, the following was gleaned from the muster rolls for Jr. 2nd. Lt./3rd. Lt. Stephen Owens of Company G (D. J. Ward's CO), 5th. Regt. Miss. State Troops for the time period you are interested in.

Nov. ?, 1862 to Feb. 23, 1863 - Absent (On Special Duty)
March & April, 1863 - Present
April 30 to July 17, 1863 - Present

I've yet to find any military service records for Sebron P. Owens, also a resident of 1860 Smith County, "maybe" he is the connection to Grierson's Raid.