Took me a while on Google to find the article.
I don't disagree with any of it.
https://cdn.shopify.com/s/files/1/0...break_in_barrels.pdf?5242045189986305547

My system [loosly based on Walt Berger's system 18 years ago] is:
1) Moly coat the bullets, not in a medium, but in a plastic container put in the Thumler's Tumbler.
2) Bore coat the barrels and fire them a few times.
3) Clean bore with powder solvent on a patch.
4) Dry patch
5) KG12 on a patch
6) wait 5 minutes
7) Dry patch.
8) 20 strokes (Kroil and Flitz) or (Witches Brew) on a bronze brush (of diameter greater than groove diameter, check brush diameter often.)
9) wait 5 minutes
10) 20 strokes (Kroil and Flitz) or (Witches Brew) on a bronze brush (of diameter greater than groove diameter, check brush diameter often.)
11) Alcohol on a patch
12) dry patch
13) Inspect bore at muzzle with magnification and a light.
14) If an Copper is seen return to step 5), if perfectly clean return to shooting

My system does not have believe in break in to do it.


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The man who makes no mistakes does not usually make anything.-- Edward John Phelps