As a side note, back in ‘84 I was at a gun show in Kodiak, AK. A guy was selling several guns and hunting gear. He said they had belonged to a hunting guide that had passed away. He had 2 M71’s, said the guide had them since new. The reason I bring it up is that one had a caliber marking of “.400 Alaskan”. The marking matched the rest of the Winchester markings on the barrel. I’ve always read that .348 is the only caliber the M71 was produced in. I’ve never heard of another sample like that .400. As much as I wanted it, my 24 year old self ended up buying an HK91A3 with all the goodies for the same $600 the guy was asking for either of the M71’s. While it was probably a custom job it was done extremely well.
Are you sure it wasn't .450 Alaskan? Those definitely existed as custom rifles. .348 was the only factory offering and the only rifle ever factory-produced in that cartridge was the Model 71 Winchester and later Browning variant.
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