Can't help you with mounts, sorry.
: On the load end of things, my .376 is on an almost identical case as the 9.3X62. It is the '06IMP, and if necked to 9.3, will chamber in many 9.3x62's.
: In the .375, I've settled on Varget and H4895 due to their being Extreme powders, and esily obtained here.
: Since loading data for the 9.3X62 and my own data on the .375/06IMP is almost identical, for same results, I'll list it. With 285gr. Speers, similar to 286gr. Norma (or others) I'm using 56gr. H4895 or Varget, which gives slightly lower veocity. The speeds run 2,450fps with the 285gr. and 2,470fps with the 300gr. RN.Interlocks and Interbonds.
: I'If you do a google search on the .375 Scovil for the site www.z-hat.com/375%20Hawk.htm , you'll find data useful for your 9.3. I'd use the lowest suggested, and go from there. Most of this data is pretty much identical to what I developed in my own 9.3X62 and .375/'06Imps.
: The 235 data co-relates to the Norma 232 Orynx, 250gr., 270, 285, and the heaviest, the 300gr.
: I found H4895 to be an incredible performer with the 235gr. speer, where a load of 62.5gr. gave a velocity of 2,845fps. If there is a need for a fairly flat shooting, long range deer load, perhaps this is it. I'd expect the 9.3 could be developed to shot the Orynx to a similar level, using that same powder - note I said DEVELOPED, not duplicated in a 1 loading test. I'd start at 58gr. and go as pressure signs indicate. For those interested in #'s, that load developes over 4,200ft. lbs., yet is a 'deer' to cow/calf elk load.
: The Barnes manual also shows worthwhile data for load developement, whether or not ou use their bullets.