I haven't handled any 22 cal bullets in quite a while.
In the Summer of 2017, I bought a NOE 225-37-FN mold for my Hornet.
I used it one casting session and made about 150 of 'em, with a alloy that I was told was WW.
I labeled a jar and on the self they sat ...until today.
I really do, like to use the old Number One for 22
This alloy is quite Hard (16.6 Bhn), sized the .227 down to .225 and put on a
copper GC, which wasn't seemingly taxing on the old Number One.
I looked up the notes from another bullet batch cast with the same batch of ingots
(came from an old guy I know, who is a regular at my local gunshow, who told me it's WW.)
Anyway, this other batch was MP's 30 SIL...Air dropped.
Hardness was 16 after 24 hours.
Then hardness increased to 18 after 4 weeks.
then back down to 16.6 after a year.
So, I have no idea what the alloy could be...I still got about 30 lbs of these ingots.
I mention all this, because I suspect someone here has a guess of what may have been
added to the WW's to loose hardness like that.