Re: Weiging cases
From a benchrest standard the tolerences should be tight and worth sweating over. Then again, a competition may be won by .0001"
From a long range hunter's stand point it isnt nearly as critical. Most LR shooters are happy with .4 to .5 MOA. This is acceptable accracy for hunting even at long range.
As long as brass is from the same lot OR the case volume is the same or very close to it, it isnt worth worring about IMHO. I have spent more time than I care in the past weighing cases and filling them with water etc.....and you know what? None of it made me shoot any tighter or better.
The things that did were using cases of the same lot AND preping them properly. Concistent neck tension is critical as well as straight necks, uniform pockets and no burrs in the flash hole. Take care of those things and you will get the desired results.
Long range shooting is a process that ends with a result. Once you start to focus on the result (how bad your last shot was, how big the group is going to be, 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.