I just ran my numbers from testing this set up through the Berger Calculator which everyone seems to swear by:
.300 PRC
26" Bartlein 5R barrel with 9.5 twist
Berger 230 grain Hybrid
SAAMI seating
The calculator calls for being 'stable' (1.59 sg) at zero altitude and 59 degrees F.
When I shot these initially, all the holes in the paper were round, repeatedly. I decided I didn't need these bullets to accomplish what I wanted so I gave the rest away. Now I shoot the 210 VLD for hunting which works just fine and doesn't need any hyper fast twist either.