Chamber issue?

[tthomp302]

Do these marks on the brass indicate a chamber issue? This is once fired brass and when ran through a sizing die it has a quite a bit of resistance and skipping but the brass comes out smooth and sized properly but with these rings. Is this a chamber issue that is brought to light after sizing?

 

[PatMiles]

Is the die clean?
What case lube are you using?
Maker of the sizing die, new or used?

 

[WSnyder]

quite a bit of resistance and skipping

The skipping while sizing is likely causing the marks and your lube technique probably needs work. If it's a new die you need to make sure it's lubed lightly but fully and your cases the same. I clean new dies with solvent, make sure they are fully dry then lube very lightly with some alcohol thinned lanolin and let the alcohol fully flash off before using. If it's a freshly cleaned older die I do the same.

 

[tthomp302]

Is the die clean?
What case lube are you using?
Maker of the sizing die, new or used?

Die is cleaned, using imperial sizing wax, Redding bushing die brand new.

 

[tthomp302]

The skipping while sizing is likely causing the marks and your lube technique probably needs work.

I reload for 284 and 6gt. Over thousands and thousands of time. Never had anything like this happen. The only difference is smith I had chamber the barrel.

 

[Eagle Six]

Out of curiosity what brand brass, and can you post a photo of that once fired brass before sizing?

 

[std7mag]

"Quite a bit of resistance and skipping" is a lube issue.
While sizing, that is....

 

[K22]

What PatMiles said plus:

Do you clean your chamber when you clean the bore?

How do the cases look when extracted from the chamber?

You should be able to distinguish between a sizing issue and chamber issue.

Imperial is one the best lubes I ever used, and it would not cause concentric rings on the case, dents maybe if too much is applied but not those kinds of rings.

 

[rwj]

Are the marks present on fired, but unsized, cases?

 

[tthomp302]

Are the marks present on fired, but unsized, cases?

I can see them on an unsized piece. Very hard to see with a naked eye, but the rings are where they show after sizing.

 

[Eagle Six]

The marks are similar to marks from a fluted chamber except those are lengthwise. Maybe those are chamber engravings. Happen to have a borescope?

 

[tthomp302]

The marks are similar to marks from a fluted chamber except those are lengthwise. Maybe those are chamber engravings. Happen to have a borescope?

I do not, I think I’ll end up pulling the barrel and sending it to my smith to take a look.

 

[K22]

I do not, I think I’ll end up pulling the barrel and sending it to my smith to take a look.

I had a Weatherby Vanguard that had a rough chamber that left vertical "rub" marks on the case and created hard extraction. My smith polished the chamber and the problem disappeared.

Many years ago, I had Ruger Blackhawk. The cases looked exactly like yours, those were tooling marks in the cylinder. Same remedy - smith polished the chambers and problem disappeared.

 

[762plinker]

chamber sucks...technical term

 

[Turpentine]

I had a Weatherby Vanguard that had a rough chamber that left vertical "rub" marks on the case and created hard extraction. My smith polished the chamber and the problem disappeared.

Many years ago, I had Ruger Blackhawk. The cases looked exactly like yours, those were tooling marks in the cylinder. Same remedy - smith polished the chambers and problem disappeared.

That was my thought. Tooling ridges/marks in the chamber.

 

[chop house]

just a thought. does every piece of brass that has marks have them in the exact same location? if so chamber, if not die (or brass)?

 

[Ray123]

So.. just use a different sizing die borrowed from a fellow reloader...against the one you own...see if the rings are exactly the same or absent....that will tell ya if its a chamber or die problem...both can be polished lightly, depending which is the culprit.
But it doesn't really harm anything if it chambers and shoots well...but its appearance.
Which can be changed by SS pin wet tumbling...or spinning case on a silicon carbide buffing wheel and it will appear as new.

 

[AckleymanII]

You die may need polishing

 

[Dusty Stevens]

Your die is polishing the ruff brass from your chamber. That chamber finish is awful and i bet you can see it with a flashlight- no borescope necessary

 

[Rodney]

Die is cleaned, using imperial sizing wax, Redding bushing die brand new.

I had the same exact thing happen to me with a new Redding bushing die. It went away after a while, I think my lube technique was the culprit. Once the die was seasoned no more rings. Can’t hurt to look at the chamber if you have a bore scope. Good luck with your research.