coelkhunter,
the 9.3x64 looks exactly like the 338 win mag with the belt turned off, and necked up to 9.3mm.
rws makes excellent brass, so that might be a place to start looking.
once you have some you are under way.
I had a 375, and was very happy with the round, but read that the x64 is on a par with it in a 30/06 length action.
the case can hold 76 gn of ar 2209 (rebadged as h4350) with a little compression, and can give full ballistics to 286 and 293 gn bullets with that powder.
it can drive a 300 gn bullet at over 2550, but I have never gone past that so can't say the limit.
from my memory of the 375, and shooting on game with a guy using one, on camels we can tell no difference.
the 300 swift has a greater s.d. than a 300 gn 375, so at the same speed any difference is on paper.
it can be loaded back to 9.3x 62 ballistics if that suits the job, or send the same bullets up to 200 fps faster if required.
that 200 fps is significant when thinking point blank range +/- 3".
my rifle is a mkx mauser with the correct barrel (Lothar walther prechambered), and the boltface redone, no other change.
feeds slick and reliable.
I got mine because I had to know how it compared to a 375.
not everyone is that keen.
bruce.