Bill,
I think you are in good hands!
Went to Frietsche's webpage, he uses Naval Brass, that is #464. It has a cold
working properties listed as "fair".
Like all these choices, the balance between desirable and undesirable properties
will need a close look. Where cartridge brass #260 excels in moving and
distorting it therefore looses in rigidity, but that may be offset with a
thicker section. Whereas naval brass will have the rigidity in a thinner
section, and have acceptable moving properties for peening dovetails. If it is
available in the required section, pretty good choice. Locally I find it hard to
source.
The worst choice would be to loose ALL cold working properties in the balance by
using #360 brass.
Cheers,
Peter
Sitting with a leg up, recovering from a badly rolled ankle ...