BREAKING IN PROCEDURE FOR LONG LIFE
Here's my recommendation for breaking in a new barrel so it will give you many years of use.
Calibers 17, 22 & 25
Should be cleaned every shot for the first 125 rounds with a clean cotton swab and then dry patched.
Calibers 6.5, 270 & 7MM
Should follow the same step at least the first 100 rounds.
Calibers 30 and Bigger
Follow the same steps at least the first 85 rounds.
If you swab and dry patch your new barrel you will get no carbon build up in the pores.
***It's a hard days work but it pays off in the long run!
THE GUN SHOP