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Easy to make a 6.5x55 SWISS (7.5 necked down). CUT OFF OLD BBL TO MAKE A STUB. FIT 6.5 BARREL TO it. Get a reamer made in 6.5x55 SWISS. Chamber it. Use 6.5 Rem Mag dies to neck down 7.5x55 cases to...

The easy way is to cut off the 7.5 bbl and thread the stub for a new bbl. Has been done a lot in Switzerland where there are all sorts of cartridges on K-31s. I know some one is USA does it but name...