Made of cartridge brass which is 70% Cu and 30% Zn.
Might be hard to find cartridge brass round bar stock?
Regular brass bar stock (63% Cu and 37%Zn) may not work as it may crack when fired..
I'd suggest you buy a few brass shell cases you could use for referance standards.
There are generally two types of brass hulls made.
One uses Large Pistol primers, and the other uses #209 shotgun primers.
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