Could it be 'HHC' for H.C. Hershey, a Hazard Powder Co. rep and winner of the 1902 GAH at Live Birds? He would have moved from Minn. and seen the light and switched to a Parker, as did Fred Gilbert and W.R. Crosby
http://www.la84foundation.org/Sports.../SL3904019.pdf
http://www.la84foundation.org/Sports.../SL3905018.pdf
"This was the first time Harvey McMurchy, of the Hunter Arms Co. ever participated in a Grand American Handicap. He said it was about time the L. C. Smith gun won this event, even if he had to do it, himself. He come all the way from California just to shoot in the race, and brought Phil Bekeart with him; to help win the prize. Both fell down, but "Mac" did not mind it when Hirschy, Spencer and Heikes won in one, two, three order, all using L. C. Smith guns.
With the record-breaking score of 78 straight kills, Mr. H. C. Hirschy, of Minneapolis, Minn., shooting Winchester Factory Loaded Shells, won the Grand American Handicap at Live Birds for 1902, the first prize of $688 and a valuable silver trophy. During the tournament Mr. Hirschy shot at 102 birds, shooting through the entire week without a miss, a record never before equaled in this great shoot. He killed 12 straight in the sweep on Monday, 12 more on Tuesday, 8 straight in the G. A. H. on Wednesday, 8 on Thursday, and on Friday 9 more, completing the 25 straight. Then 10 more in the tie the same day, and on Saturday he finished 43 straight to win making a total of 102 straight. He used an L. C. Smith gun, 3 1/4 drams Hazard smokeless, 1 1/4 ounces No. 7 chilled shot in Winchester factory-loaded Pigeon shells."