Bullet type matters?

[DynoDan1]

Can't see.

Leade on a new, not overly well cut, chamber.
View attachment 1026338

Barrel with around 1400 rounds on it
View attachment 1026340
View attachment 1026341
View attachment 1026342

Okay, here's some pics of the barrel with the mirror attachment.

Do these look okay?

 

[Nature Boy]

Do these look okay?

It looks dirty, which is the extent of my ability to discern anything meaningful from a bore scope pic

 

[Walkalong]

Do these look okay?

Chatter marks in the barrel, which will foul easily, some cracking/erosion, some fouling. Does it shoot well?

 

[DynoDan1]

Chatter marks in the barrel, which will foul easily, some cracking/erosion, some fouling. Does it shoot well?

Hmm... Okay.
It pretty much looked like that when it was brand new but maybe a little more shiny back then.
It shoots excellent...to me.

 

[DynoDan1]

It looks dirty, which is the extent of my ability to discern anything meaningful from a bore scope pic

Really?
Compared to what it was, it is definitely way more clean.
Should I clean it again?
How clean do I need to get it?
The cleaning patches come out pretty clean even when soaked in acetone.

 

[DynoDan1]

Can a bolt face throw the alignment of the cartridge out of alignment?
Can a case head that isn't perfectly square with the bolt face affect cartridge alignment?

 

[Varminterror]

Chase rabbits which get you fed. Concentricity sorting isn’t one of them.

But is easy to find/fix, so I do.

Agreed. But pointing out, there’s a big difference in figuring out where eccentricity is introduced in your process then improving that step to eliminate the eccentricity rather than continuing to use a busted process which introduces run out, then use a bandaid solution of sorting out the most busted cartridges.

Culling defects creates waste. Correcting a process to reduce defects is progress.