The match brass is about 1/2 way between commercial brass and standard LC mil brass. I just measured some the other day. Winchester vs LC-69, that I had made into 7x57 brass, and the LC-69 had about 2 gr less of water capacity.
For .06 , I always used 2 gr less of powder in the LC-69 regular military brass as compared to the same load with commercial brass, then worked up a little. It depends on what powder you are using too.