Back in 2008 I had a Trueflite Ultra Match 7mm barrel. It copper fouled terribly at first. Over 24 hours of cleaning and soaking to remove the copper after ONE shot (using boretech eliminator). You could see the copper on the lands at the end of the barrel. I did the shoot and clean each shot for 10 shots, took over a week to do this because the fouling was so bad. Then 3 shots clean etc. After a hundred or so rounds the copper was a lot easier to remove, I just went hunting and normal shooting after about 20 rounds to break in barrel.
For my latest rifle I didn't bother with a break in process and the copper fouling hasn't been anything unusual.
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