This thread got weird.
Reeves used just straight cartridge brass, 70/30. He told me so a number of times. Also, he ended up owning the foundry he was using, I believe. I'm not sure what the deal is with his daughter at this point as I found it impossible to contact her. I have seen her castings though and found them somewhat materially the same as was Reeves was selling although I don't think she's tumbling them. Reeves tumbled his castings and that's why they were always shiny and 'slick' looking wth no grit to remove, but on the other hand, that process rounds edges which means when you file them up for inletting they get even smaller.
I don't know the exact details of his casting process but the reason his stuff seemed so soft was simply because it was extremely well-annealed. Other than that it was straight cartridge brass.
The stuff from the foundry Mike is using is great, it's not quite as 'bendy' as what Reeves had but it's quite soft and it's good yellow brass, good yellow color. I don't know the exact alloy, maybe Mike will tell us if we actually ask a direct question. Mike what's the alloy? You probably already told me but you know, getting older and all.
I don't need to tie a trigger guard into a pretzel so as long as I can bend things or planish/pien them without immediately cracking, and the color is right, I'm good.