Generally when I start load development with rifle, I'll do 1% jumps. In this case .3 or .4 grain increments. You might come back and fine tune, but it should give you an indication of what's going on. As I approach max, I might do smaller increments.
Looking at Sierra data, and cross referencing with yours, I might go up to 43.5 grains. You generally won't find the max load to be the most accurate anyway...
Let us know how they turn out.