I've been working up some loads with the Nosler 250 and Re10x with excellent results - I think it may now be my new favorite powder for the 9.3, at least with this bullt (I haven't used the 270 or 286 yet).
I've run it up to 57 grains (with a 3.4" OAL) with no pressure signs (
in my custom model 70, work up slowly, etc.). CCI200 primers in Lapua cases. Recoil is stout, but accuracy is top notch, as good or better than Re15 or H414 (my other two favorite powders). I'm going to try 58 and 59 grains next time I go to the range, I suspect these will be at or even a bit above above max, but I like to find out where it is, and then back off a grain or two.
I've not run them over the chrony as mine recently died, so I'll have to report back later on velocity.
I tried everything from 50 to 57 grs, and, amazingly, all shot sub moa, with 56 grs being the best - about 0.4-0.5MOA (3 shots).
Anyway, Re10x appears to be a real winner in the 9.3x62 - in the accuracy department for certain, and I'll bet it puts out pretty good velocities too. Anyway, be cautious, but give it a try.
