The 9.3x74R case is smaller in diameter at both the base and the shoulder area. The 9.3x62 barrel would have to be set back approximately 1 3/4" so the 9.3x74R reamer would completely clean up the existing chamber - otherwise, no go.

A fatter case could be used, perhaps some .35 or other NE necked up or down to 9.3mm - perhaps.

Careful measuring would have to be made to ensure the 9.3x62's .455" shoulder did not interfere with the re-chamber. Do not believe the .451" for the 9.3x62mm shoulder measurement as listed in some manuals. I've measured 3 different 9.3x62's fired brass and all expanded the shoulders to .454" or .455". (which, incidentally is the same as ANY Ackley IMP on the 'standard case, from .250 Savage to .375Whelen).

edtied

Further- the 9.3x74R base is only .465" nominally, with a .414" shoulder, some 2.039" ahead of the rim's base.

The 9.3x62 has a .475" nominal base measurement with a shoulder of .455", 2.064" ahead of the rim's base.

The barrel would have to be set back, so the 9.3x74R base of .465" was larger than the case body of the 9.3x62mm case- thus my estimate of 1.75", set-back, just to be safe. Not many commercial bolt actions have a shank length that will allow this much set-back.