Here's a shot of the case forming operations for the 358 Nukalpiaq. (I got my picture, clicker, poster fixed)
From the left.
The basic 375 Ruger brass (cylindrical).
The same case after a trip through the 404 Jeffery sizer as form die #1.
Then through the 358 NUK. body die for form die #2.
The finished and trimmed case.
The unfired 375 Ruger standard brass. Note the shorter neck.
Loaded 358 NUK with 275 grain Kodiak.
Loaded round with 280 Swift A-frame.
(The lense makes them look uneven but are identical formed cases.)