Re: Testing new loads.
While there are more forgiving ways to get concistent results, I use the same tools at the range as I do in the field. A bibod used in the prone position with a rear stock support such as a backpack or rolled up clothing. This way, there is no doubt in my mind when I am in the field that the load is tuned and sighted in to the method I am shooting my critter.
Long range shooting is a process that ends with a result. Once you start to focus on the result (where the shot goes, how big the group is, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.