Inconsistent Neck Tension

[Uncle Ed]

You can wet tumble or use an ultrasonic cleaner that removes all the carbon from the case neck.

Then all you need to do is dip the case neck in powdered graphite (carbon) and a expander will smear a fresh coat of carbon inside the case neck.

And if you notice the directions with Hornady One Shot tells you to make sure you spray the inside of the case neck. Meaning get the dry film lube inside the case neck.

Efficient Big-Batch Case Lubrication — Best Methods
https://bulletin.accurateshooter.com/2020/06/efficient-big-batch-case-lubrication-best-methods/

If you don't like powdered graphite you can spray Hornady One Shot inside the case neck like the Army Marksmanship Unit does.

The best part about reloading is the person pulling the press handle decides how to do it. And the OP found his problem! If you wet tumble you should trim and deburr the cases every time to remove the case mouth peening.

Uncle Ed Nailed it the culprit was burrs inside and outside of the casses
Well no more tumbling, have bought a ultrasonic cleaner, I have never had this problem before but there is always a first time.
Thanks for all the input.
I learned a lot.

 

[rardoin]

Shiny doesnt do anything for me, just clean primer pockets. Thanks for ur input. May try the rice, Scott generally has pretty good and proven ideas.

Go rogue for a test. Try not cleaning your brass and not cleaning the primer pockets and test a ten shot group at distance comparing to your usual prep. You might find a way to save time.

 

[Sandstorm]

You might find a way to save time.

Sign me up for saving some time...Thanks Robin