Obviously they did not have any concerns about the use of the rifle in civilian hands 70 years after a losing war and civilian shooter's difficulty of reloading for the thing.
LOL!! The 6.5 Carcano was initiated ca. 1891, long before the 6.5 Swedish, 6.5 Jap, the 6.5 Mannlicher, and even the 6mm Lee Navy. In it's day, it was cutting edge technology. Why later developers chose to pursue a slightly smaller diameter bullet is lost to history, but the fact remains that the 6.5 Carcano was the pioneer of small bore smokeless cartridges.