i would suggest to work up the load and not randomly pick 26.4 as your starting load.
load 3 or 5 rounds starting at the low end and shoot some groups, get some trigger time and inspect each round after you shoot it starting with the obvious very light loads.
this will also help you learn what to look for in low pressure Vs high pressure signs in your rifle.
you may notice that the low pressure empty brass look more "dirty" since may not have full expansion to seal the gasses blowing around the brass for example.



























