From time to time we get on the subject of load development here at TFF Ammo and Reloading Forum, and I always recommend the Audette Ladder test to anyone asking my opinion on the best load development method. Its the method I use because its faster than the conventional method of loading 5 at each increment and shooting the groups, its just as definitive, and it saves valuable ammo. Here is a link that describes exactly what the ladder test is and how you use it to develop a load for your rifle or handgun.
I have my own method of doing the Ladder test. Instead of shooting one POA on one target and recording the individual POIs on a separate sheet, I decided it would further simplify the process and eliminate the need for recording where the shots hit on a shooter copy of the target by making up a master sheet (quite large of course) with 20 separate targets on it. Labeling each individual target with the number of the shot and the load it contained. Of course you do all of this before shooting the test and set it up so you work from left to right, and top to bottom. Here is an example of the test i fired today with my savage .308 at 200 yds.