Hoping for some early clarification regarding codes on the underside of a commercial Mauser barrel.
The rifle is an Oberndorf Type B currently heading to my location but not yet in my possession. Enjoying a bit of pre-ownership research and quickly discovering the limits of my knowledge on European sporters!

From the pics sent to me, it appears to be an 'I' bore, ie .318 rather than .323 (7.85 bore, 8.07 groove diameter?) but has a clearly visible 'S' stamp as well. The serial number dates it from the early 1920s, retailed in India by Walter Locke.

So, gentlemen, will my current stock of 8x57 reloading components feed this rifle?

I have owned an 88 Commission rifle converted from 'I' to 'S' bore by simply deepening the rifling grooves, but assume if this was done on a sporter the old codes would be struck out. Further, I would have thought 1922 is a bit late for this procedure.

Apologies for my ignorance, on the learning curve, any and all info gratefully received.
Cheers