If you don't have to have all the velocity of which the 300 RUM is capable, then here's a quote from Nosler:

Quote
Our technicians were surprised to find near benchrest accuracy was achieved when medium weight bullets were teamed with IMR 4350 and a Federal 215 primer.


80 grains with a 180 at a little over 3100 is their stated accuracy load, and they don't show it as max either.