Thanks for posting this.
In addition, the M-S 6.5x54 cartridge was used in the M1903 Mannlicher Schoenauer sporting rifle - which did enjoy a degree of popularity in Canada, with ammunition being made here.
As noted in the video, there is essentially no evidence that Cooey had anything to do with making these rifles. The rifles were introduced at the beginning of the Depression - when any opportunity for business and manufacture were prized. Austria was on the losing end of WW1, and anything to keep shop doors open would have been welcome. Look at the sported Mausers, Geha shotguns and Deutsch Werke .22s that came out of Germany in this period.
I suspect the necessity of using the clips would have become a real limiting factor for continued use of these rifles.
While the rifles and ammunition look to be very inexpensive, keep in mind that wages were low in the '30s. My father earned $10 a week in a lumber yard.
Incidentally, I had a fellow bring me 6.5x52 M-C cartridges with badly flattened primers. Shooting 6.5x52 M-C cartridges in one of these 6.5x54M-S rifles is not a good idea. Serious headspace issue.
I posted a thread on CGN about rebarreling one of these rifle to 7.62x39. Having broken down that rifle and a few others, these conversions were not badly done. Whoever did the work was skilled, and productive. The use of the original barrel breech as a bushing allowing a cylindrical, non-shouldered barrel to be installed has merit.
Given how frequently these rifles turn up, there must have been a lot of them sold.