The Merkel 140-2 has always been made chambered for 375 H&H Magnum, 416 Rigby, 470NE, and 500NE! However, the reason the 375H&H, and the 416 Rigby is not the best choice for a double rifle is not because of the pressure, but because they are rimless, or belted rimless rounds. This is not the best choice of rounds in a double rifle because of the tiny palls used for extraction, are pritty flemsey, and are opperated by tinier springs, that have little power to resist dust jamming. The rimless cartridge is OK, but still not the best idea, in a rifle used to hunt deer, but is a definte No NO in a dangerous game rifle, IMO!
Merkel would be much better off to chamber that rifle with a 450/400NE 3", or the 500/416NE, and the 375H&H Flanged instead of the belted rimless round.
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DUGABOY1, and MacD37 founding member of DRSS www.doublerifleshooterssociety.com "If I die today, I have had a life well spent, for I've been to see the Elephant, and smelled the smoke of Africa!"