From the NitroExpress.Group on facebook:

Sanjyot Bhandari Does it fire the same belted 375h&h cartridge

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Chandrakant Deshmukh
Chandrakant Deshmukh Sanjyot Bhandari it can fire a belted rimless as well as flanged cartridge thats the beauty of my rifle. Its dead on 100 yeards with 270 grs bullet

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CD posted several photos of his sidelock Heym double rifle in .375. One set of barrels in the photos.

He appears to be claiming he can shoot both magnum belted catridges AND flaned/rimmed cartridges in the same rifle .... only way I could think is one barrel for each, crazy ...