The Kernal;
Sorry on that suspected caliber designation, my stubby little ol fingers hit the key above what I intended. That should have read 9.3x72R. I am hesitant to use the terms ever or always, but generally speaking the bore was designated by Millimeters instead of the gauge marks in 1912. This gun likely predates that.
The 9.3x72R is a long tapered case having no bottleneck. Bullet dia is about .364". In its black powder loadings it was about the equivlent in power of the American .38-55 but in later Smokeless powder loads it closely approached the .35 Remington.
Your shot bbls are definitely smokeless powder proofed, BUT not for American loads meeting SAAMI specs. With the bbls detached from the action look up & down it & see if there is a nitro mark on the rifle bbl itself. It may be in the form of a crown over N. If not so marked then the rifle portion would only carrt black powder proof.
