It's easily done, especially with relatively unknown firearms, such as the Swiss straight pulls.
Not everyone is concerned with all of the pertinent details involved in the firearms they own and many don't even know where to look for the info.
All they care about is that the firearm performs as it's supposed to and finding suitable ammunition.
At least the OP had presence of mind to to find out if the cartridge stamped onto the side of the barrel, was safe and appropriate.
IMHO, the 1889 rifles are at least the equal of the 94 Winchester rifles when it comes to strength