Was just reading a bench shooting book, recommended cleaning the barrel between shots with Shooters Choice for the first 20, then every 2nd or 3rd shot for the 20 or so. Never tried that, but not a bad consideration.

Then you get in the discussion of 'how many rounds to break-in a barrel'? Was at the range with my heavy barrel .243 the other week, advice to me was 100 rounds starts to get the barrel started to break-in with tighter groups. The rate of fire for heating up a barrel was the discussion topic that day, seems the standard barrel is not designed to handle high rate of fire as compared to a mil spec. But it takes some heat of rounds to get the barrel through a good break-in routine. Might try some research on that premise.