In Howell's MS CS soldier index, I find:

"Bell, Leroy, Pvt., Co. E, 3rd Battalion Infantry (State Troops)," as you found. This was, as you noted, a "Minute Men" organization.

I also find:

"Bell, Leroy, Pvt., Co. B, 2nd MS Infantry (also listed as 'Lee')"

Since Co. B of the 2nd MS Infantry was raised in Tippah County, MS, I guess he's not your guy, unless y'all have family ties between the two counties.

Wish I could have helped more! -- Jim Huffman, Gainesville Vols