The .318WR is by far the easiest cartridge to make a set-up in a M98. I was caught in that dilemma when I had my now .333Jeffery made up. I was thinking this:

1) Both calibers requires special bullets.
2) Both calibers requires special brass.(I know about the 8x60mauser)

I those the .333Jeffery for the obvious reasons:

1) It shoots a 300grain bullet.
2) If I want to, I can get close to a .338WinMag, if I feel the it has not power enough.
3) If I were anyway to go thru a true customrifle project..I might aswel go all the way.
The .333Jeffery is a specialty-round today as back then in 1908. If I wanted to save
money, I could shoot 250grain woodleighs from a bored out 8x60mauser(from 8x57)
Customprojects is not about saving money, its about follow the dream, and remain faithful
to the end, with no shortcuts.

It took me over 4 years to complete my .333Jeffery, and thrue that time I learned a whole lot about Mausers, barrelmaking and whole lot of huntinghistory. Its a rifle today, that I won`t never sell. One of my two sons will take over one day. I have one spare London proved metfordrifled barrel left, the day the rifle needs to get rebarreled..or I decide to have a last rifle made up.