The most accurate barrel I have is Chrome-molly.
Bartlein is currently the top seller in custom barrels.
I like the twelve twist so much I could never go back to a ten. 11 or 11.25 might be the ticket for the berger 185's.
Shilen Standard or Heavy Varmint seams to f it your bill. It is not in what they call savage drop in but in the custom barrel area you will f ind it.
You can do it with a 24. Are you at sea level?