You should be able to find quite a bit about ladder testing from a search, there have been several good threads on that in the last few years.
You are doing an important part of what it takes to become a LR shooter. I often run into guys at hunting camps around the country and when shooting at 500 to 1000 comes up, a common statement will be "you must be a really good shot"......... some say this with a little respect others with a little sarcasm.
My response is normally the same....... shooting long range is not about being a "good shot" (at least not in the way they are thinking) It is about "knowing how" and having the equipment that makes such a shot possible.
For example; I was at a 4-H rifle coaches training program a few weeks ago. Several of the people there know me and know how much I shoot LR. When we got started shooting (.22s standing, sitting, prone (no rest)) they expected me to just clean up. I did OK but several were obviously "better shots" than me and had much less shooting experience, but give me "my rifle" with "my gear" shooting the way I want to shoot and anything within a 1000 yards is in trouble. Those same people who "ate my lunch" shooting .22s at 50 yards standing would not even know where to start to make a 1000 yard shot......so who is the better shot???
The old mantra of "practice, practice, practice......" is important, but with LR shooting "practice" is just burning ammo if you don't "know how" and and have the proper equipment. Keep learning, you are on the right track, asking the right questions