Further to a PM discussion with a member he compared the M03 2013 Catalog with a 2019 Catalog.

Since 2013 they have discontinued the following:
222 Rem;
223 Rem;
22-250 Rem;
6.5x57;
8.5x63;
300 Wby Mag;
338 Blaser Mag;
338 Win Mag;
416 Rem Mag;
458 Lott; and
404 Jeffery.

Also a lot of cuts to the M98 round up. But not the M12 per the NE member.

Per the 2019 catalogue the calibres offered are listed in the table on page 36. At the top of the table are column headings of the calibres listed:

.243 Win.,
6,5x55SE,
.270 Win.,
7x64,
7 mm Rem. Mag.,
.308 Win.,
.30-06,
.300 Win. Mag.,
8x57IS,
8x68S,
9,3x62,
.375 H&H Mag.

But further down the table in the left row headings is the following:

Barrel Length .375 H&H
Mag./.404 Jeffery
Barrel-Ų .375 H&H
Mag./.404 Jeffery

So they MAY still offer the .404 Jeffery? Only way to tell is to enquire.

Pretty sad for a switch barrel rifle system to offer such a meagre amount of cartridge chambering choices.

Myself, another member on NE, and probably other users would look for a series of barrels which cover the following:
a small bore barrel such as .222, .223 or .22/250;
a medium bore barrel in the 7mm to .338 range;
a bigger bore barrel which could be a .375, but the .404 or .416 added a much better larger bore choice;
and maybe a magnum type choice eg .300, 8x68S or .338 Blaser magnum. Of course offering only 24" barrels lets this option down as well.

How Mauser shoots itself in the foot, IMO, and harms its models the M03 and the great Mauser 98.

While probably pouring resources into the Blaser ...