Just had an email with Jeff Roberson of RCC brass. They use CNC lathes and mills to manufacture brass cartridges and specialize in obsolete, vintage, hard to find and wildcat calibers, plus custom head stamps. They replicate head stamps similar to the original manufactures and also put their company logo on them (not making exact replicas), but everything else is like they were manufactured aside from being lathe-turned instead of drawn brass. He said a lot of the original cartridge specs are difficult to find, but that they have approximately 2,000 different drawings and are always looking for more information. He said they are also glad to share their information with others too.