Can the .404 jeffries be built on a standard lenth 98 Mauser action.

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Yes, that's one of the many pluses.

But you need a new magazine box. And no one makes one. So...

I am thinking about building one. Where would I get the box magazine. I have the action and a couple of pieces of circassion wood.

Thats THE best action to build a .404 on.

If you cannot find a gunsmith to make one for you, take your old box to a machine shop and have them make one from similar materials. I had one made for a 458 Lott that cost $160 but is more solidly constructed than anything I have seen in a factory rifle. It dropped right in to the action and has held up under some horrendous recoil.
Good luck
Frank

quote:

Originally posted by blaser93:
I am thinking about building one. Where would I get the box magazine. I have the action and a couple of pieces of circassion wood.

Unfortunately no one makes mag boxes for the .404 to sell. And the .404 mag box differs in dimensions and angles from a box for the .416, .375 or .458. However, there are gunsmiths who will build a custom .404 rifle. But it is expensive. I doubt they will sell you just a mag box, because then someone will still need to get it to feed, and that's not a task for just any gunsmith.