Will this brass still make accurate ammo

[JRBullock1987]

11 firings.
Alpha munitions 6.5cm OCD LRP brass
Ive Annealed every firing. Now theres these wonky ridges on the insides of the necks and can feel them slightly on the outside but theyre not as pronounced as the insides are. When I resize I always full length size using the sac die with the expander mandrel inside so its all in one step. Does anyone know what causes this? And how to avoid this in the future? My other lots of brass dont have them at 5 and 4 firings.

 

[JRBullock1987]

That pic was taken after firing and annealing, I haven't resized them yet. I'll resize a couple and send a picture in and see if anybody can tell if it's smoothing those wrinkles out or not. I'm using the .286 bushing with the .2625 expander, mandrel. my neck thickness is about .145"

 

[straightshooter1]

11 firings.
Alpha munitions 6.5cm OCD LRP brass
Ive Annealed every firing. Now theres these wonky ridges on the insides of the necks and can feel them slightly on the outside but theyre not as pronounced as the insides are. When I resize I always full length size using the sac die with the expander mandrel inside so its all in one step. Does anyone know what causes this? And how to avoid this in the future? My other lots of brass dont have them at 5 and 4 firings.

I've seen the same kind of thing on the inside of my brass necks, but not near as pronounced. I've never seen or felt anything on the outside of the neck and none of mine have looked like that right after firing. After firing, it just looks completely coated with burnt powder residue.

I do anneal after every firing and clean the necks outside with some steel wool, then lube and size just the outside of the case without cleaning the inside of the neck. After dry tumbling, to remove lube, I then use an expander mandrel to expand the necks and I always get some of that. Since I don't clean the inside of the neck, other than what the dry tumbling does, I figure what I see is just from the residual powder residue that the expander mandrel is rubbing on. What I see appears to be so thin, like in microns, that with the residual lube from tumbling it just doesn't seem to have any affect.

 

[JRBullock1987]

I've seen the same kind of thing on the inside of my brass necks, but not near as pronounced. I've never seen or felt anything on the outside of the neck and none of mine have looked like that right after firing. After firing, it just looks completely coated with burnt powder residue.

I do anneal after every firing and clean the necks outside with some steel wool, then lube and size just the outside of the case without cleaning the inside of the neck. After dry tumbling, to remove lube, I then use an expander mandrel to expand the necks and I always get some of that. Since I don't clean the inside of the neck, other than what the dry tumbling does, I figure what I see is just from the residual powder residue that the expander mandrel is rubbing on. What I see appears to be so thin, like in microns, that with the residual lube from tumbling it just doesn't seem to have any affect.
View attachment 8740785

Yeah my suppressor really coats the outside so it takes forever to dry tumble the outside clean. By then the inside is clean. Sucks cause id like to keep some residue on the inside of the necks

 

[tomme boy]

Are you cleaning the inside of the neck after annealing with a brush? I not that is where these are coming from.

 

[straightshooter1]

Are you cleaning the inside of the neck after annealing with a brush? I not that is where these are coming from.

I do not.

I let my dry tumbling do the minimal cleaning of the neck's interior.

 

[tomme boy]

you have to brush the inside to remove the scale or what ever it is from annealing them. What you are seeing is the brass is galling inside the neck.

 

[straightshooter1]

you have to brush the inside to remove the scale or what ever it is from annealing them. What you are seeing is the brass is galling inside the neck.

That's what I thought when I saw that for the first time and thinking I should also see something like that on the bearing surfaces of pulled bullets. So I pulled some bullets to take a look; bearing surfaces were as smooth as they were before seating with no signs of galling or scrapes. If there's brass partials, like what might come off a chamfer from a dull cutting tool, that galls the inside of the neck that's brass, they'd surely do the same to the softer surface of a bullet. Huh?

 

[KnowNothing256]

What’s your dry tumbling process? I use Flitz in my walnut media, and if I saw what you’re seeing, I’d tumble a few test pieces for a longer period of time and see if that removed it.

If it did, I’d do the whole batch that way, with the expectation that I’d have to rechamfer the necks after.

 

[Maurygold]

11 firings.
Alpha munitions 6.5cm OCD LRP brass
Ive Annealed every firing. Now theres these wonky ridges on the insides of the necks and can feel them slightly on the outside but theyre not as pronounced as the insides are. When I resize I always full length size using the sac die with the expander mandrel inside so its all in one step. Does anyone know what causes this? And how to avoid this in the future? My other lots of brass dont have them at 5 and 4 firings.

Given how much residue is still on the outside of the case I also think they’re just not getting cleaned well. My walnut tumbler with fitz give me very clean and shiny brass (left)

 

[tomme boy]

The marks are happening when sizing not when seating a bullet. It can happen when seating but it is usually during the sizing when the expander is pulled through