My 1919 RNWMP contract New Service is .45 Colt, and all of the 1930's contract N.S. I've seen are .45 Colt.
Having said that, I talked to a fellow on the weekend who claims to have a .455 N.S. which is post WWI.
I have now checked my references for clarification on this issue - in particular
"Small Arms of the Mounted Police" (R. Phillips and S.J. Kirby, 1965) and
"Arms & Accoutrements of the Mounted Police , 1873-1973" (R. Phillips and D. Klancher, 1982).
There is some apparent confusion in identification of calibers acquired, but my "best guess", based on both references, is:
1. All New Service Revolvers acquired by the Force up to and including 1914 were .455. Definitely all 700 purchased in 1904, and distributed in 1905, were .455 caliber. However, of a total of 650 which were sent in 1913-14 to Thomas Birkett & Son of Ottawa (most but not necessarily all of which were destined for the RNWMP) the first 250 are identified as .455. but for the other 400 (sent in 4 separate shipments during September of 1914) the caliber is not specifically identified in the detailed Appendix listings in
"Arms & Accoutrements". They must also have been .455, however, since the main text indicates that the first .45 revolvers were ordered in 1919.
2. Subsequent New Service purchases by the RNWMP seem to have been almost entirely chambered in .45 Colt, starting with 100 revolvers shipped directly to the Force in July 1919. A total of 1,905 New Service revolvers are listed by serial number in purchases ranging from July 1919 through July 1942 (the final shipment.) In the Appendix, these revolver shipments are identified as .45 Colt or no caliber is specified.
3. However, apparently one last batch of 25 revolvers chambered in .455 were acquired by the RCMP in late 1932. Ironically, that particular shipment listing in the Appendix is identified as being ".45 Colt" but it was the
only RCMP purchase of service revolvers between 1919 and 1932, about which the main text specifically states: "No more Colts were purchased until November 25, 1932, when 25 in .455 Eley calibre were shipped to the Ottawa headquarters of the RCMP. None of these, the last in that calibre bought by the Force, appear to have been stamped with issue numbers." Accordingly, I presume that the ".45 Colt" specified in the Appendix listing for these 25 revolvers is a typographical error.
The authors don't state this, but I would hazard a guess that this odd acquisition of a mere 25 revolvers at that time was to enable replacement of condemned revolvers on issue in Western detachments - i.e. so there wouldn't be one or two Members issued with .45 revolvers when everyone else in that detachment had .455's. Even so, considering that no new .455's had been acquired after 1914, I imagine that they had to be also issuing .45's out west, and that the best they could try to do would be to keep the caliber the same within a particular detachment or Division ....
Lee Enfield: the serial numbers of all 25 1932-purchase New Service revolvers are listed in the Appendix - ranging from 331931 to 332086. Any chance you can find out the serial number on the revolver owned by the fellow you mentioned? Would be interesting to see if it is listed.
While discussing Mounted Police .455 caliber revolvers, I should perhaps also expand a bit on my earlier statement about their use of Webley revolvers (i.e.
"they didn't, really"....) My wording was equivocal on purpose because I recalled that a few Mark VI Webley revolvers had ended up in Mounted Police service after WWI. Phillips and Klancher mention them in passing, and do even illustrate one, but don't clarify how many there were (likely well below 50 in total, from 'reading between the lines') .... nor do they specify how they came to be used by the Force. Webley revolvers were not issued to Canadian military personnel during WWI (our troops used .45ACP M'1911 Colt pistols and .455 S&W "Hand Ejector" revolvers) but my other references do indicate that .455 Webley revolvers were used by some Canadian troops who served under British command echelons. In view of the fact that many RNWMP served during WWI, particularly in Provost capacities, perhaps these .455 Webleys came back with them ....