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.

 

[Edsel]

You can really feel the creases on the outside?

For lack of better words…

Are those “longitudinal wrinkles or donuts” formed when sizing the necks down?

EDIT: Looking at how the SAC die works…

Could it be possible that the necks are too thin?

I would speculate that there’s a mismatch between the dimensions of the mandrel, case neck (thickness), and bushing.

 

[Edsel]

After watching the video…

…really beginning to suspect it’s from a mismatch as above.

Unsure if it’ll affect your accuracy, much less sure if neck tension’s actually affected.

Pure speculation on my part, wait for others to chime in…

 

[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