I see. I would have to assume that by 1898 they would be making and proofing rifles for Nitro, they wouldn't be making other rifles weaker sensibly. The barrels are heavy fluid steel and the action seems very large. But that is about all I know on the subject.
I have been searching for the book, but it is out of stock in all the places I have tried. Maybe it's time to try again. If someone has one for sale, I would gladly buy it.
Thanks for the help. Is there more loading data for this cartridge in this book or others?