The March 1900 Forest & Stream advertised a Parker Bros. calendar showing eminent shooters which included Kirkover
https://books.google.com/books?id=UkohAQAAMAAJ&pg=PA218
The calendar for 1900 issued by Parker Brothers, Meriden, Conn., is adorned with a number of new portraits of eminent shooters, with condensed records of their marvelous doings in 1899 with the Parker gun. Grouped around an excellent portrait of Charles Parker are those of Messrs'. S.A. Tucker, Capt. A.W. du Bray, John Parker, W.F. Parker, C.W. Budd, E.C Griffith, W.A. Hammond, Fred Gilbert, O. R. Dickey, F.D. Alkire, G.R. Hunnewell, J.R. Malone, Harold Money, C.F. Ridge, C.E. Robbins, H.W. Brown, A.B. Cartledge, C.M. Powers, J.F. Jordan, F. H. Snow, H.D. Kirkover, E.E. Neal, J.H. Mackie, H.G. Wheeler, A.H. Frank, C.M. Hostetter, A.H. Fox, F.E. Sinnock, Sim Glover and Col. J. T. Anthony.

Here he is in 1913
https://archive.org/details/rodguncan15cana/page/306/mode/2up?q

He was quite the sportsman, and still at it in 1916
https://digital.la84.org/digital/collection/p17103coll17/id/24100/

https://sites.google.com/a/damascusknowledge.com/www/home