In Memoriam: John Linebaugh—1955-2023 | An Official Journal Of The NRA
John Linebaugh, inventor of the .500 and .475 Linebaugh cartridges and custom pistolsmith, died March 19 at his home in Clark, Wyo. The road that led him to a permanent place in gunmaking history was far from a typical one.
Source: americanrifleman.org