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…