I shoot 250 grain .358's in my 9x57's. Suggest you slug the bore as they can vary considerably. Two of mine slugged at .356", one at .354". Chamber necks in all easily accomodate a .358" seated so no separeate "swaging" of bullets before loading is required. A chamber cast should be made prior to assuming .358's can be used.
TeeBone, you sure you're not thinking of a 9,3x57?
