Thanks to all who responded. Sounds like the 380's are the right choice - thanks for the confirmation - now I'll have to see if Rhino Man has any left.

The testing I did with the Rhino 380's indicates very good accuracy, nearly double the expansion of a 300 gr X with no loss of penetration, and no tendency to tumble in an aqueous media. I also tested these bullets in dry media (sand, dirt, wood, etc) and I found the bullets did not expand, and bent and hooked through the material - but that's not what game animals are made of.

I settled on a load of 84.0 grs of H-4350 (.375 Ultra) which according to my Ohler produces an average of 2311 fps for 5 rounds - none were under 2300. 85.0 grs did not increase velocity to any measurable degree (2330) but more recoil, and 85.0 grs gave me pressure signs on the brass.

We'll be hunting with Mark Sullivan, but as yet I don't know which concession we'll be hunting.