It's understandable why the 303 was/is a popular caliber all service cartridges are popular for the same reasons. What I found interesting were the comments about all the American calibers that were "sold" to Canadians. In the same thread people a waxing nostalgic about the 30-30, 300 Sav.,250-3000 etc. all are American designed cartridges usually chambered in American rifles. Even the Mounties carried Winchesters and Colt New Service revolvers.
By the way I have 2 sporterized Mk4 SMLE rifles. I bought one 6 months ago for $30 at an auction it was missing the magazine, and the cheapest magazine I've found cost $40 something wrong there. Does anyone know of a good side mount for a scope, both have had their issue sights removed.