Brass scraping chamber walls

[Rsadams]

That doesn't look like carbon and molly to anybody else..????

 

[RyeGuy]

How much runout in the sized cases?

I do not have concentricity gauge.

The measurements .550-.545 are those at the 0.200 line on the case. If you were able to measure @ .200 the fired and sized .549 would be ok for a Saum chamber. Although one firing and 0.005 growth seems like a pressure issue? Repeatable measurement @ the 0.200 line is tough, most calipers are +,- 0.001. Polishing the chamber should be possible with your measurement numbers and sizing die.

Those are at base. I stick the base of case in calipers and the walls of case run the length of calipers jaws, so I catch the largest OD. if that makes sense.

Not an expert at bore scope interpretation. Looks like cotton patch fibers attached to burrs in the chamber. Is it a factory barrel. Did you have an amatuer gunsmith chamber the barrel? Cannot image what caused that big gouge mark. A light polishing the chamber may help.

I think your looking at pic 4? Those are the scrapings of the black sharpie marker coming off brass. No the GS is pretty well known and builds a bunch of custom "hunting rigs". I do have a good one from him. Its a proof barrel. Bottom line is its not right, it needs a new barrel. Ive never been able to get this to shoot. Ive even sent it back to him last year to check out. " Action screws needed torqued" was his answer.

 

[mikecr]

I do not have concentricity gauge.

If you roll cases on a mirror, do they wobble?