The first report of Dickey competing in
Sporting Life was 1895
http://library.la84.org/SportsLibrar.../SL2425017.pdf
1895 DuPont Live Bird Championship
O.R. Dickey, of Boston, Mass., used a very handsome Parker Bros, hammerless gun, of the Pigeon model, and his load consisted of 50 grains, or about 3 1/2 drams by measure, of American “E.C.” powder, 1 trap wad, one 3/8 inch pink felt, one 1/4-inch pink edge, and 1 1/8 ounce of No. 7 chilled shot in the United States Cartridge Co.'s “Rapid” shells (he was a USCC Rep), 2 3/4”.
http://library.la84.org/SportsLibrar.../SL2606012.pdf
He won the 1896 GAH and used the same load and gun
http://library.la84.org/SportsLibrar.../SL2701022.pdf
He also operated a shooting park in Wellington, Mass., and marketed a "Dickey" target (not the "Dickey Bird" out of K.C.)
He was still a Professional Rep in 1916
http://library.la84.org/SportsLibrar.../SL6722021.pdf
http://library.la84.org/SportsLibrar.../SL6823021.pdf