by Hoot » Wed Jul 29, 2020 1:01 am
I've seen worse tooling marks. Those look about average depending upon how many rounds have already gone down that barrel. A proper lapping will clean those right up but first refresh me. Approximately how many rounds have gone down that tube? it may just not be broken in yet.You can treat it with some of those fire lapping bullets kits.
This is important: I've seen bores with worse marks still produce reliable small groups.
Their only issue was how often do you want to be cleaning them? I clean at the end of every range session while the barrel is still warm but that's more for the usual crud produced. I treat for copper buildup in my shop, where I can scope them and only clean as long as it take to get the copper out, with JB compound. That's not lapping, that's aggressive cleaning. Lapping involves either silicon carbide or diamond powder grit, suspended in a carrier oil and using laps that were cast to match the bore's rifling. Once neglected buildup is removed, then I only need to patch out the small amounts with KG12 copper remover. Note: Not recommended in chrome line bores.
Hoot
In Theory, there is no difference between theory and practice. In Practice, there is.