I also suggest you work up your loads using some sort of ladder test.
when i work up new rifle loads.. I load about 5 at mionimum and then start creeping up in .5g increments, making 3 rounds each till I get about 1gr away from max.. and then stop.. and go fire those noting where my best accuracy and groupings came from.. then the 1-2 that gave me best.. I go redevelop those with .1-.2 gr differences up and down till I 0 in on the load that is best accuracy and grouping.. then i record that in my notebook for future relaoding.
I do this on multiple powder types.. then compare the data sets.. see what powder and what load grains give me best. I also usually try 2 different projectiles.. or 3.. etc. for instance.. in 30-06 I worked up some 180g flat base spire points.. no crimp, for a bolt gun.. and then 150g and 170g spbt with a cannelure and crimp for semi-auto guns.
I then can compair all those data sets to see what I need to load, depending on what I am shooting. paper targets.. deer etc.. bolt gun.. or semi auto.. i got it all down in my spiral notebook.. so next batch is via cookbook..