My reference for the Mounted Police is; Arms & Accoutrements of the Mounted Police, 1873 - 1973, 1982 Museum Restoration Service, Roger Phillips & Donald Klancher.
For the Canadian Military see; Canadian Military Handguns, 1855-1985, 1994, Museum Restoration Service, Clive M. Law.
Rattlesnake Jack may have some other references.
For the Mounties the short list is; Adams Mark I in .450 Adams, Enfield in .476, COLT NEW SERVICE in .455 and .45 Colt, various .38S&W breaktop snubbies (carried by railway guards in the Yukon), and almost any S&W or Colt revolver in .38 could be found somewhere, as the NWMP absorbed the Dominion Police and several Provincial forces along with their kit. Oh Yes; Sam Steele carried his own C96 Mauser in South Africa.
For the military, a very short version is the following list; 1851 London Colt, 1878 Colt in .45 Colt, Any British sidearm as they came and went, Colt New Service in .455 as well as the S&W equivalent, Colt 1911, S&W "Victory" and M&P, Browning Hi-Power as made in Canada by INGLIS ( still in widespread issue).
Another source, slightly off your query is; Defending the Dominion, Canadian Military Rifles, 1855-1955, 2003, Service Publications, David W. Edgecombe.