Mysterious brass shrinking… pls help!!!

[Fire Dog]

Yes Sir, #9 doesn’t do much but protect your bore from rust.

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[ELR LVR]

Need to send your brass in to get it Cryo- Treated

 

[6BRA]

Are you lubing the inside of the necks. With what? The mandrel seems to be pushing the necks back/shorter?

Set the bushing to size for .002" neck tension Skip the mandrel. Add neck turning to the brass prep.

OR use a bushing that only allows the mandrel to expand .001"
STOP over working the case necks.

Better accuracy is achieved by sizing 1/2 of the necks. This centers the bullet in the chamber. After about 3 firing, the unsized neck has fully expanded to the chamber.
Donuts are no longer a problem.

One would think the freebore centers the bullet. Cartridge case acts like a wedge. Many opinions.