From the article "Savage Model 840 And Its Stevens Roots"
Quote:
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It was quickly followed by the Models 322 and 325 that were chambered in .22 Hornet and .250 Savage (a.k.a. .250-3000), respectively. The Hornet chambering proved very popular, but the Model 325 was quickly abandoned when it was discovered that the bolt was not strong enough the for the high-pressure cartridge.
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Read more:
http://www.shootingtimes.com/2010/09...#ixzz2seFIwCF5
Considering that the "high pressure cartridge" in question is the 250 Savage with a SAAMI max pressure of 45,000 cup, rebarreling one to 460 S&W, with a SAAMI max pressure of 65,000 psi seems like a spectacularly bad idea. Remember the 340 / 840 only has one locking lug.