Dutch Schoultz said:RonRC,
Work on just one rifle till you are satisfied. Each subsequent rifle will be easier.
I had a subscriber some years ago who wandered around rifle ranges and quickly worked out the problems people were having. All he used was his micrometer and a bunch of different fabrics of varying sizes.
I lent him a number of books just before he moved to Arkansas and died.
Write down what your experiments are so you don't get yourself confused.
Dutch
I plan on that very thing. will choose the most accurate (or two) of each caliber and cull the rest.