The .375 Ruger was designed specificaly for .30-06 length actions so on a long action I would say all you need is a proper size bolt
head, a new barrel and nut and recoil lug. Not sure about the .416. You may not get as many cartridges in the magazine for the .375, probably one less. Friend of mine has a .375 Ruger he took to Africa and loved the cartridge.
El Lobo
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