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Simple rechambering??? The 7.5x55 has a .500" case head diameter like 284 Winchester, which is hugely oversize for the .473" 308 Winchester case head. To properly rechamber a 7.5x55 K-31 to 308 you would have to set the barrel back about 2". The barrel set back would mean that the rear sight would have to be removed and given the quick reduction of the barrel forward of the receiver, there might not be enough barrel meat for a barrel stop.
I wonder if they swaged in an internal chamber sleeve, followed by a 308 reamer.
Nevertheless, it was done, and many thousands of times, too. I have a 300m match rifle made from a modified K31 action and a 7.62x51 Schultz & Larsen barrel. Obviously, some work was done to the action to change it to single-shot and the trigger was changed for another and work done to the bolt, too.

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The statement was to the claims of rechambering. Rebarreling is totally different.
My as issued K-31 delivers accurracy close to my Glen Nelson M1A. Both are awesome shooting rifles, but Glen's rifle cost me 10x more.
 
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The statement was to the claims of rechambering. Rebarreling is totally different.
My as issued K-31 delivers accurracy close to my Glen Nelson M1A. Both are awesome shooting rifles, but Glen's rifle cost me 10x more.
Understooded.

BTW, that there rifle of mine cost me £120 - that time, around $150. The Gehmann sights and Centra mini-bipod cost another $450....... :(
 

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