If I had to build 5 Model 70s to hunt the world over, I would base the builds on previously offered factory cartridges to keep from having to do too much bolt/magazine changes. Mine would look like this:

1. 22 Hornet (with FW contour barrel, Biesen style stock)
2. 243 Winchester (I'd make this an M70 version of the M700 Varmint Special)
3. 270 Winchester (O'Connor/Biesen copy)
4. 300 H&H (David Miller style)
5. 375 H&H (Echols Legend)