Gunsmithing Which Wyatt's box for R700SA feeding SAUM?

[knockemdown]

Gents,
Have a 700SA in 300WSM coming to build a SAUM on. Will be needing all the c.o.a.l. space I can for running high b.c. bullets.
Stock will likely be an B&C Ti Stock w/ factory BDL floorplate for now. If I dig the rifle, might upgrade to a GameScout later on.

Question is: which Wyatt's box would you use for this application?
1. CFE-5 (center feed) or,
2. MBE-5 (staggered feed)

I realize that the receiver will need relieved rearward to accomodate the box, just not sure if the center feed box would work better for the fat SAUM cases?

Thanks!