A 103 .005 in and .005 off 30.6 and 31. Out of those 4 groups, one will workIts an amazing cartridge.
Alex,
Unfortunately I have not been here long enough to earn the much coveted secret decoder ring, and because of that am unable to decipher your post. Would you mind elaborating on what "A 103" means? I'm feeling a little left out because I see Rushty gets it, but I don't.
I am considering switching from 6BR to 6BRA with my next barrel, and this might be a valuable clue as to what reamer is used.
Inquiring minds will want to know.