Thanks Daryl. They are really great guns and they handle well. Especially the 146 with its heavier barrel than the 640. Modern FZH Mauser 98 actions alone cost $3500 USD. So the FN is a sweet deal at 10% of that price.
Xausa, Max COL for .318 is 3.35"(with solids), standard 146 mag is 3.31". A quick pass with an end mill will thin out the rear of the mag wall but this is not necessary unless you use solids which are useless for hunting. The 250gr softpoints made by Woodleigh are 1.302" long compared to 1.419" for solids. Swaged .333 softpoints will also fit in standard mag with no mods.
The 8mm Mauser with full loads and 250gr Woodleighs will duplicate .318 ballistics and hard to distinguish the two without looking at the headstamp.

Westley Richards claims to have invented the mauser 98.