Oh my ... not a common chambering for a bolt rifle. Usually double rifles or Ruger #1s.
9,3x74R
Max OAL =3.740 Rim diameter = 0.5240
.375 H&H
Max OAL = 3.600 Rim diameter = 0.5320
.416 Rigby
Max OAL = 3.760 Rim diameter = 0.5902
Looks like an action that will feed a Rigby should work for the 9,3x74R. The bolt face of the .375 H&H is a little large ... may have to open up a smaller one.
Will likely have to fiddle w magazines and followers some.
Real question is why bother ... the 9,3x62 makes just a little more velocity and is much more easily used in a bolt rifle.
BTW: I have two 9,3x62 bolt rifles and a 9,3x74R double rifle.
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