I am just getting started with a 30 x 47 and would like to know what some of you have had some luck with. My brass is Winchester 300 Savage with a large primer.
N135 could work well with the 135 sierras. Somewhere around 42 grains. You could also try Winchester 748, for the 135's, somewhere around 42.5 grains. That is a classic 30 x 47 load. I have no experience at the heavier end of the spectrum.