The 66th Ill [4 x Missouri Companies, 3 x Illinois Companies, 2 x Ohio Companies, 1 x Michigan Companies] the western counterpart to the Eastern Berdan sharpshooters, was present and they had around 150 of the Dimick Rifle [55cal, octagonal barrel], these were specialized target rifles. There is a difference between effective range and maximum range, Whitworth had a maximum range of 1050 yds, the Springfield rifle was 900 yds; do not know what the Dimick's maximum range was, but it was originally designed for long range shooting on the plains and very few were made. Most of the 66th at that time were armed with 16 shot Henry repeaters.
This shows 66th Illinois Infantry Regiment time frame on Feb.24, 1864 as being in Illinois:
"January 22, the men received four months' pay and $100 veteran bounty. On the 23d, left Louisville and took cars for Chicago, where they arrived January 28, and marched to North Market Hall, Here the Regiment received its thirty days' veteran furlough.
On March 3, 1864, the Regiment re-assembled at Joliet, Ill.,"
Although, that may just be part of the unit that had returned to Illinois.
You are correct, upon further review: the Ohio companies also went to Chicago, and then to to Ohio as their enlistment time was up.
It was the 1st Ohio SS Bn[3 yr enlistment-dec62'] that was present, the 5th Ohio SS company of that unit in 1864: "they were engaged in a protracted scout between the hostile lines in February"
Feb 26th 1864: "26 Weather pleasant and warm
report that our men had a
fight three mills this side
of Dotlon " - Diary of LaFrancis E. Hackett 5th Ohio Sharpshooters
"After eight years as President I have only two regrets: that I have not shot Henry Clay or hanged John C. Calhoun."--1837