Expander mandrel on primed brass?

[Brathany]

With a calibre specific nylon brush, same sold for barrel cleaning.
A little goes a long way, the difference with/without is amazing, even when using expander balls…no screeching and smooth as silk.

Cheers.

Pretty messy ordeal? I know graphite to be like anti-seize.

 

[MagnumManiac]

Pretty messy ordeal? I know graphite to be like anti-seize.

No mess, dip brush in, tap off excess and brush away, each dip does a half dozen cases.
HBN, on the other hand is MESSY!

Cheers.