Follow the link to an 1863 ordnance report for Wharton's Brigade (of which Terry's Texas Rangers, aka 8th Texas Cav., were a part).

You'll note that at that time, the 8th Texas had five .56 caliber carbines. The 3rd Confederate and 14th Alabama Cav. each had one. As it is a known fact that the 8th Texas carried revolving Colts, and this is an odd caliber, I think that it is a certainty that these were all Colts. It should be noted that there may have been other caliber Colt revolving rifles/carbines in use but the .56 caliber is the only one that can be readily identified on the list. In addition, I think it likely that among the number of shotguns are also Colt revolving shotguns.

Also, of note, it would appear from the report that there was no ammo on hand for the .56 caliber Colt revolving rifles, unless they were using the .57 caliber ammunition (but, I don't know if that is possible or not).

And by the way, I have seen a Colt revolving rifle or carbine (don't remember which it was) that was inscribed to Terry's Texas Rangers, and which was purported to have been sold off from the Texas Ranger Museum.

One more tidbit, Trigg's Brigade (CS) captured twelve Colt revolving rifles from the 21st Ohio and 89th Ohio and the 22nd Michigan at Chickamauga.

That brigade consisted of the following:

Trigg's Brigade.
Col. ROBERT C. TRIGG.
1st Florida Cavalry, Col. G. Troup Maxwell.
6th Florida, Col. J. J. Finley.
7th Florida, Col. Robert Bullock.
54th Virginia, Lieut. Col. John J. Wade.