COW or maybe Walnut?

[Griz44]

For the cream of wheat crowd, has anyone tried fine grit walnut media instead?

 

[Walkalong]

Going down my barrel?

 

[Bitswap]

I assume your talking about a filler for fire-forming brass. I wouldn't use walnut for that... too abrasive... not to mention how it will react the the round goes off because of its density.

 

[ClarkEMyers]

Walnut as used in tumblers tends to clump. Perhaps a finer grit would do better.

 

[sharps59]

for filler I use grits