There are no muster rolls for De Moss’s 10th Tennessee Cavalry after August 27, 1863 at Kingston, Tenn. As such, records for your Charles Reynolds will not be found after he resigned from the infantry.

He did file for a Confederate Tennessee pension,

Charles Louis Reynolds, 2nd (Robison’s) Inf., filed for Tennessee Confederate pension, application number S12012 from Davidson County

See also http://www.tennessee.gov/tsla/history/military/pension018.htm

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See http://www.tngenweb.org/civilwar/csacav/csa10cav.html for a short history of the regiment