What I've found

[MFG_BOP]

Do you guys think those can make 9 or 10mm projs?

http://www.aliexpress.com/item/Lovely-Jewelry-100Pcs-Copper-Tone-Blunt-Necklace-End-Tip-Bead-Caps-10x11mm-Fit-9mm-B04311/1711734620.html

Cheers

[Swede 45]

Don't know much about this topic, but description says " zink alloy"?

[IllinoisCoyoteHunter]

Wonder how thin they are because they would more than likely have to be drawn to length. May stretch them a bit thin.

[runfiverun]

Zinc alloy is what bullet jackets are.
Anyway those are 9mm inside diameter so would make good 40 cal jackets.

[Red River Rick]

Zinc alloy is what bullet jackets are.

You ment Copper alloy...............95% copper / 5% zinc.

RRR

[SquirrelHollow]

They look very inconsistent...