Look at Jon Speed's "Mauser – Original Oberndorf Sporting Rifles", page 127, table 222. It's a list of the magazine box dimensions the pre-war Mauser factory used. The box lengths used for various chamberings:
69 mm = 2.76" for 6.5x54 Mauser K, 8x51, .250-3000 Savage (K action)
79 mm = 3.11" for 7x57 (intermediate action)
84 mm = 3.31" for 8x60, 9x57, 10.75x68 (standard length action)
85 mm = 3.35" for 9.3x62
88 mm = 3.46" for 7x64 and .30-06
92 mm = 3.62" for .318, .333, .404, 9.3x64 (some standard length, most often magnum actions)
All longer magazines used magnum length actions then:
95 mm = 3.74" for .350 Rigby, .375 H&H, 8x75, 8x68
96 mm = 3.78" for .280 Ross
97.5 mm = 3.84" for .416 Rigby.
Mauser frowned upon the practice of opening up standard length actions to take longer cartridges like the .375 H&H. This became common practice after WW2 only when magnum length actions were not available any more. Even the FN "Magnum" actions are merely opened up standard length ones. RWS and Brenneke went another way. When they resumed production of their 8x68S and 9.3x64 cartridges in the 1950s, they seated bullets deeper to keep cartridge oals at 87 and 85.6 mm and thus fitted them to standard length actions and magazines.