With a 9.25 twist, I'de say find the heaviest load in a factory offering that you can. Based on my experience loading 168 gr bergers, i would pass on the HSM ammo. Bergers like being loaded close to the lands, and I dont think the COAL of the HSM will get you there. I switched to the 180's and initial tests got me at .75" at 200.
As far as facory ammo, someone has a 175 grain offering, but who exactly escapes me at the moment.