Following up on Fede’s answer……The “British” Lorenz Ammunition Company (formally Latimer Clark & Muirhead) of Millwall, London was owned by Heinrich Wilhelm Lorenz (i.e. DWM). This company became involved in early 303 trials in 1888 after it was noted early on that the lead cored copper jacketed Rubin bullets were prone to splinter and separate on impact. They and Friedrich Hebler offered uncoated steel bullets as an alternative. Initial concern over unwanted barrel wear was settled when 3000 rounds were fired through one barrel and no excessive wear was noted. A further concern over potential rust was not, however, completely solved and the use of these bullets was dropped. The notation of a .303 Martini-Henry action rifle linked to “Lorenz” in your document probably relates to this research effort. As it was very early in the .303 development, I would guess that the “Lorenz” cartridges were Rubin type rimmed cases with Rubin profile bullets. Perhaps there is a sample of one of these uncoated steel bullets up at Leeds.
Source: Appendix D, Progress Report #4, Committee of Small Arms (PRO…SUPP 5 / 912)