I have owned a boxlock ejector double rifle, built in 1939 for the rimmed 8x60 Magnum - with a .318 groove diameter.

I currently posess a Bartel's Mauser from the mid-20's, chambered in the .318 groove 8x60 Magnum.

Both rifles set up for hot loads an jacketed bullets.

We have a couple of members here from the Motherland who can clarify the timeline and historical significance to the marketing vernacular specific to the suffix of 'normal' and 'bombe'

I simply load mine with Woodleighs and run them to hit to the sights. That keeps things simple and I have no concerns as to how well they'll kill game.

Cheers
Tinker