Gol1; If you aren't using the .378, it makes sense to use the action to build something you will use. It might be a slow seller as is. Check the extraction rim diameter on the .338 Lapua. I don't know what it is, but the Wby .378 is .579-.580". That may be too big.
I like Mauser actions, but if I had a Wby available to use, I wouldn't buy anything else. (If the bolt face works).
The MK V's are smooth and very strong actions. Large capacity cases shooting heavy bullets is where they excel.
Have fun, whatever you decide. Tom
Texas State Rifle Association Life Member
NRA Endowment Life Member
A big fast bullet will beat a little fast bullet every time
Last edited by specweldtom; 08-20-2008 at 09:37 PM.